MEMO CX20 Fast Cooling Magnetic/Clip 2-in-1 Mobile Phone Semiconductor Cooler for iPhone & Android

Keep your smartphone cooler during demanding games, live streaming, recording, and other intensive workloads with the MEMO CX20 Fast Cooling Magnetic/Clip 2-in-1 Mobile Phone Semiconductor Cooler.

Designed specifically for mobile gamers, the CX20 combines TEC semiconductor refrigeration with active fan cooling, helping draw heat away from the rear surface of your smartphone more effectively than a basic fan-only cooler. MEMO equips the CX20 with a strong magnetic mounting system plus detachable clips, allowing it to work with both magnetic-compatible phones and a wide range of standard iPhone and Android devices.

The CX20 also features RGB lighting, USB Type-C power, a high-speed dynamically balanced fan, and a compact lightweight body, making it ideal for PUBG Mobile, Call of Duty Mobile, Genshin Impact, Mobile Legends, emulation, streaming, and extended smartphone gaming sessions.

Key Features

• TEC Semiconductor Cooling – Actively transfers heat away from the smartphone instead of relying only on airflow.
• 2-in-1 Mounting System – Supports both strong magnetic attachment and detachable clip mounting.
• Strong Built-In Magnetic Ring – Full-circle magnetic design provides a secure attachment to compatible phones and magnetic cases.
• Universal Clip Compatibility – Official specifications list support for smartphones approximately 62–105mm wide when using the clip system.
• Fast Active Cooling – Semiconductor plate works together with a high-speed fan to quickly move heat away from the device.
• Large Cooling Contact Area – MEMO lists an approximately 40mm-diameter cooling area.
• High-Speed Cooling Fan – Official MEMO specifications list approximately 5500 RPM fan operation.
• Dynamic Fan Balancing – Designed to reduce unnecessary vibration and operating noise.
• RGB Gaming Lighting – Integrated lighting gives the cooler a distinctive gaming appearance.
• USB Type-C Power – Convenient wired operation through a Type-C interface.
• 10W Rated Power – Manufacturer specifications list 5V/2A input and 10W power for the CX20.
• No Internal Battery Required – Runs continuously while connected to a suitable USB power source.
• Lightweight Design – Approximately 66g according to MEMO's specification.
• iPhone & Android Compatible – Magnetic or clip installation allows use across a wide range of smartphones.
• Ideal for Mobile Gaming – Helps manage the extra heat generated during graphically demanding games.
• Useful for Streaming & Recording – Cooling can also benefit phones under sustained workloads such as live streaming or video recording.

Specifications

The manufacturer currently lists the CX20 with 5V/2A input, 10W rated power, approximately 5500 RPM fan speed, RGB lighting, 66g net weight, Type-C input, and compatibility with devices around 62–105mm wide when using the clip attachment.

TEC Semiconductor Refrigeration

The biggest advantage of the MEMO CX20 compared with a simple clip-on fan is its use of thermoelectric semiconductor cooling.

The cooler operates using the Peltier effect: electrical power creates a temperature difference across the semiconductor cooling plate. The cold side contacts the phone while heat is transferred toward the heatsink and expelled by the fan.

This provides two stages of thermal management:

1. TEC cooling plate pulls heat from the phone.
2. Cooling fan removes heat from the heatsink.

This type of active cooling is particularly useful when the smartphone processor and GPU are operating at high loads.

Helps Reduce Thermal Throttling

Modern smartphones protect themselves from overheating by reducing CPU and GPU performance when temperatures become too high.

This process is known as thermal throttling.

During demanding gaming sessions, thermal throttling can contribute to:

• Reduced Frame Rate
• Frame-Time Instability
• Performance Drops
• Lower Screen Brightness
• Increased Touch Discomfort
• Slower Charging

By helping remove heat from the rear of the phone, the MEMO CX20 can help the device maintain a more stable thermal environment.

Actual gaming performance will still depend on the smartphone, game, graphics settings, ambient temperature, and mounting position.

Fast Ice-Style Cooling

MEMO promotes the CX20 as capable of producing an extremely cold cooling surface under suitable operating conditions.

The manufacturer's published testing references cooling-plate temperatures below 0°C in approximately 26°C ambient conditions, with quoted test values around -7°C to -2°C depending on circumstances.

These figures refer to the cooling surface under test conditions, not a guarantee that the complete smartphone or battery will reach those temperatures.

Actual temperature will vary according to:

• Ambient Temperature
• Smartphone Heat Output
• Phone Case
• Cooling Position
• Power Supply
• Contact Quality
• Game Workload
• Airflow

Large Cooling Contact Area

The CX20 uses an approximately 40mm-diameter cooling area, allowing the cold plate to make substantial contact with the rear of a compatible phone.

Proper positioning is important.

For gaming, place the cooler as close as practical to the main heat-generating area of the smartphone without interfering with:

• Camera Modules
• Gaming Triggers
• Charging Cables
• Controller Attachments
• Your Hand Position

2-in-1 Magnetic + Clip-On Design

One of the CX20's most useful features is its ability to support two mounting methods.

Magnetic Installation

For compatible magnetic phones or magnetic cases, simply align the cooler with the rear magnetic mounting area.

The CX20 uses a full-circle strong magnetic structure designed to keep the cooler firmly attached.

This provides:

• Quick Installation
• Easy Removal
• No Side Clips
• Clean Gaming Setup
• Convenient Repositioning

Clip-On Installation

Not every Android phone or iPhone supports direct magnetic attachment.

For these devices, the CX20 can be used with its detachable clip system.

MEMO lists compatibility with phones approximately 62mm to 105mm wide, giving the CX20 broad support across different smartphone sizes.

This makes it suitable for many phones from brands such as:

• Apple
• Samsung
• Xiaomi
• Redmi
• POCO
• realme
• OPPO
• OnePlus
• HONOR
• Huawei
• ASUS ROG Phone
• nubia REDMAGIC

Compatibility ultimately depends on the physical size, rear shape, camera position, and case being used.

Magnetic Sheet Support

For a non-magnetic phone, a compatible magnetic ring/sheet can also be used when suitable.

MEMO cooler instructions for its magnetic models explain that a magnetic sheet can be placed on the rear of compatible phones so the cooler can attach magnetically.

For maximum cooling performance, the cold plate should sit as flat and directly as possible against the phone or a thin thermally suitable surface.

High-Speed Dynamically Balanced Fan

The CX20 uses an active fan to continuously move warm air away from its heatsink.

MEMO specifies approximately 5500 RPM for the CX20 fan and describes the fan as dynamically balanced to reduce unwanted vibration during operation.

This is particularly useful during:

• Competitive Mobile Gaming
• Live Streaming
• Voice Chat
• Screen Recording
• Long Gaming Sessions

RGB Gaming Lighting

Integrated RGB lighting gives the MEMO CX20 a more distinctive gaming appearance.

It pairs especially well with:

• RGB Gaming Rooms
• Mobile Gaming Controllers
• Gaming Finger Sleeves
• Gaming Earphones
• Smartphone Triggers
• Gaming Desks
• Streaming Setups

The lighting operates while the cooler is powered.

USB Type-C Powered

The MEMO CX20 uses a USB Type-C power input.

This provides flexible powering options from compatible:

• USB Wall Chargers
• Power Banks
• Desktop PCs
• Laptop USB Power
• Powered USB Hubs

For best performance, use a power source capable of supplying the required voltage and current continuously.

No Built-In Battery

The CX20 is designed for plug-in operation rather than relying on an internal rechargeable battery.

This provides several advantages:

• No Cooler Battery to Recharge
• No Battery Degradation
• Continuous Operation When Powered
• Lower Overall Weight
• Better Suitability for Long Gaming Sessions

You can connect it to a power bank when you need a portable setup.

Ideal for PUBG Mobile

PUBG Mobile places sustained load on both the CPU and GPU, particularly when using:

• High Frame Rates
• High Graphics Settings
• Long Matches
• Screen Recording
• Voice Chat

The MEMO CX20 can help remove heat while you play, making it particularly useful for competitive PUBG Mobile setups.

Great for Call of Duty Mobile

High-refresh-rate multiplayer gaming can cause smartphones to become warm quickly.

The CX20 is a useful accessory for:

• Call of Duty Mobile Multiplayer
• Battle Royale
• Ranked Matches
• Long Gaming Sessions
• Competitive Events

Cooling performance does not directly increase a phone's hardware capability, but better thermal management can help reduce heat-related throttling.

Great for Genshin Impact

Open-world games such as Genshin Impact are among the more demanding workloads for mobile processors.

The CX20 can help manage heat during:

• Exploration
• Combat
• High Graphics Settings
• Extended Sessions
• Charging While Gaming

Great for Mobile Legends & MOBA Gaming

The CX20 is also useful for longer competitive sessions in games such as:

• Mobile Legends
• League of Legends: Wild Rift
• Honor of Kings
• Arena of Valor

A cooler-running phone can also feel more comfortable to hold during extended matches.

Ideal for Mobile Gaming Controllers

The compact design allows the CX20 to be incorporated into many mobile gaming setups.

It can be paired with compatible:

• Telescopic Controllers
• Bluetooth Gamepads
• Gaming Triggers
• Phone Stands
• Finger Sleeves
• Gaming IEMs

Check physical clearance before combining the cooler with a controller that grips the back or sides of the phone.

Useful for Live Streaming

Gaming is not the only workload that produces sustained smartphone heat.

The CX20 can also be useful during:

• TikTok Live
• Facebook Live
• YouTube Live
• Mobile Game Streaming
• Video Recording
• Long Video Calls

Streaming can simultaneously use the processor, camera, network connection, and display, increasing heat generation.

Helps During Video Recording

Long-duration high-resolution video recording can cause some smartphones to heat up significantly.

External cooling may help reduce surface temperature during compatible recording setups, particularly when the phone is mounted on a tripod or stationary stand.

Always make sure the cooler does not block the camera module.

Compact & Lightweight

MEMO lists the CX20 at approximately 66g, making it small enough for mobile gaming and travel.

It can easily fit inside:

• Gaming Bags
• Backpacks
• Laptop Bags
• Accessory Cases

This makes the CX20 useful for gamers who regularly play away from home.

Compatible with iPhone

Magnetic attachment makes the CX20 particularly convenient for compatible iPhones and magnetic cases.

For other iPhone configurations, use the clip or a suitable magnetic mounting accessory.

It is useful for mobile titles including:

• PUBG Mobile
• Call of Duty Mobile
• Genshin Impact
• Warzone Mobile
• EA Sports FC Mobile
• Mobile Legends
• Racing Games

Compatible with Android

The included clip system extends compatibility to many Android devices, with MEMO quoting approximately 62–105mm device width support.

This makes it practical for gaming phones and mainstream Android models that do not contain a native magnetic mounting ring.

Perfect For

• iPhone Gaming
• Android Gaming
• PUBG Mobile
• Call of Duty Mobile
• Genshin Impact
• Mobile Legends
• Warzone Mobile
• Competitive Mobile Gaming
• High-FPS Gaming
• Gaming Phones
• Mobile Streaming
• Screen Recording
• Video Recording
• Mobile Gaming Controllers
• Gaming Events
• Gaming Cafés
• RGB Gaming Setups
• Long Gaming Sessions

Why Choose the MEMO CX20 Mobile Phone Cooler?

• Powerful TEC semiconductor refrigeration.
• Active semiconductor + fan cooling system.
• 2-in-1 magnetic and clip mounting.
• Strong built-in magnetic ring.
• Broad smartphone compatibility.
• Supports approximately 62–105mm phone widths with the official clip specification.
• Approximately 40mm cooling contact area.
• Approx. 3844mm² heat-dissipation area.
• High-speed cooling fan.
• Approximately 5500 RPM official fan specification.
• Dynamically balanced fan design.
• RGB gaming lighting.
• USB Type-C power.
• 5V/2A rated input.
• 10W manufacturer-rated power.
• Lightweight approximately 66g design.
• No built-in battery to recharge.
• Works with compatible USB chargers and power banks.
• Suitable for iPhone.
• Suitable for Android.
• Great for PUBG Mobile.
• Great for Call of Duty Mobile.
• Great for demanding open-world games.
• Useful for streaming and recording.
• Helps manage heat during intensive smartphone workloads.
• Brand: MEMO.
• Model: CX20.

Package Contents

MEMO's manufacturer listing for the CX20 indicates a package containing:

• 1 × MEMO CX20 Mobile Phone Cooler
• 1 × Detachable Clip Set
• 1 × Approx. 1m USB Type-C Power Cable
• 1 × User Manual
• Retail Packaging

Some current retail batches additionally list a magnetic sheet/ring among the supplied accessories, so package contents should be checked against the exact stock received before advertising it as included.

Important

Cooling Temperature: Sub-zero figures advertised for semiconductor phone coolers refer to the cooler's contact plate under specific laboratory or ambient conditions. They are not guaranteed smartphone battery or processor temperatures. MEMO's own CX20 testing references cold-plate operation below 0°C under approximately 26°C ambient conditions.

Condensation: Powerful semiconductor coolers may cause condensation or frost when the cooling plate falls below the surrounding air's dew point. Avoid allowing moisture to enter the smartphone, charging port, cooler electronics, or other connected accessories.

Phone Cases: Thick or insulated cases can significantly reduce heat transfer. For strongest cooling, direct contact with the phone or a thin compatible case is generally preferable.

Magnetic Compatibility: Phones without suitable magnetic hardware require the supplied clip or an appropriate magnetic ring/sheet.

Wireless Charging: The CX20 is a cooling accessory, not a wireless charger. Remove or reposition it when wireless charging is required.