Memo CX19 Phone Cooler Review: Semiconductor Cooling Meets Wireless Charging

The Memo CX19 Phone Cooler does something most phone coolers don't — it combines a Peltier semiconductor cooling element with built-in wireless charging. That's a genuinely useful combination for anyone who hates juggling a charging cable and a cooling clip at the same time.

But this isn't a budget buy, and it's not designed for everyone, although it is worthy. Here's everything you need to know before deciding whether the CX19 belongs on your desk.

What Is the Memo CX19 Phone Cooler?

The CX19 is the latest addition to Memo's growing cooler lineup, which also includes the CX12, CX16, CX20, and CX21 this year. While those models focus purely on cooling performance, the CX19 takes a different approach — it targets users who want to charge wirelessly and keep their phone from overheating while doing it.

That dual focus shapes every design decision in this product, from the size of the cooling contact surface to the price tag.

What's in the Box?

The packaging is a basic plastic box — functional, nothing fancy. Inside you'll find:

• C-to-C charging cable: Required for higher-power input. The CX19 supports 9V/3A and 12V/3A input protocols, so a quality PD charger is recommended.
  
• Metal ring sticker: Helps to attach to non-MagSafe devices
• Magnetic clamp set: No adhesive metal rings needed. The clamp attaches directly to your phone or case.
  
• User manual: Covers input specs and basic operation.
  

Design and Build

The Memo CX19 comes in an all-black colorway — matte body with a glossy panel in the center where the LED display sits. It's understated rather than flashy, but there's a clean, unified look to it that doesn't feel cheap.

Circular heatsink fins wrap around the top of the unit. They're large enough to dissipate heat effectively. The cooling contact surface is approximately 4 cm in diameter. That's intentionally limited by the space taken up by the wireless charging coil inside. It's a trade-off inherent to this type of product, not a manufacturing shortcut.

Two mounting slots on the sides accept the included clamp using a push-and-lock mechanism — straightforward and much easier to work with than the older CX07 and CX08 clamp systems.

Controls and Display

The CX19 keeps its interface simple. One button on the top cycles through operating modes. The LED screen shows three pieces of information at a glance:

• Temperature reading (approximate, sensor-based)
  
• Lightning bolt icon — wireless charging is active
  
• Snowflake icon — semiconductor cooling is active

Mode Cycling

 

However, I have to mention that the temperature display isn't perfectly accurate. There's a gap between what the screen shows and what a surface thermometer reads at the contact point. But this is common across Peltier coolers because the sensor and the contact face are in different positions. In practice, use the display as a rough guide rather than a precise measurement.

The ability to turn off the LED with a long press is a small but useful detail, especially if you use the cooler while watching videos or gaming at night.

Power Output

Real-world power draw measured during testing:

• Cooling + Wireless Charging (phone not yet connected): ~13–15W
  
• Wireless Charging only (cooling off): ~2W (fan and LED only)
  
• Cooling only (wireless charging off): ~14W

The CX19 draws its full load from the cooling element. Make sure your charger supports at least 9V/3A output to get consistent performance.

Cooling Performance

Idle Test (No Phone Attached)

The CX19's contact surface reached approximately -8.8°C during standalone testing. That's a solid minimum temperature for a cooler with a wireless charging coil sharing internal space.

Load Test (Simulated Heat Source)

Starting from a heat source at around 48°C, the CX19 brought the temperature down to approximately 36°C within a few minutes — a reduction of roughly 12°C. The cooling was most effective directly at the contact center. Outer areas of the phone cooled less dramatically.

For context, a pure cooling unit like the Memo CX15 can push temperatures below 30°C under similar conditions. The CX19 trades some cooling headroom for wireless charging functionality. That's a deliberate compromise, not a defect.

Wireless Charging Performance

Wireless charging is the CX19's defining feature. Here's what real-world testing showed across different devices:

• Xiaomi 14 Ultra (~89% battery): Total system draw ~24W; estimated ~10–11W delivered to the phone after subtracting cooling load
• Realme GT5 Pro (~49% battery): ~9W delivered wirelessly
• iPhone 15 Pro (~80% battery, charging-only mode): ~10–11W; gained approximately 3% battery in 8 minutes

Maximum wireless charging output sits around 10W. It's already quite good as an auxiliary function. We can't argue it.

iPhone vs. Android Using Experience

iPhone users from the 12 series onward have MagSafe built in. The CX19's wireless coil aligns automatically and magnetically, no clamp required. This makes for a seamless, hands-free setup that's noticeably cleaner than any cable-based option.

Android users have three options: use the included clamp, attach a metal ring (purchased separately) to the back of the phone, or use a case that has a built-in wireless charging alignment ring. It works, but it takes more setup.

If you're using an iPhone, the CX19 experience is meaningfully better. Android users with fast wired charging — 60W and up — may not find enough value in a 10W wireless charging cooler. You have experienced quick charging, but its charging is too slow.

Price and Value

The Memo CX19 is priced at roughly $35.9. It puts it at the higher end of the phone cooler market. That price is expected — any cooler integrating wireless charging components will cost more than a dedicated cooling-only unit. And this price includes the delivery fee and tax on phonecooler.com.

If your budget is tight and wireless charging isn't a priority, Memo's own CX16 or CX20 delivers stronger raw cooling performance for less money. The CX19's price makes sense only if wireless charging is a feature you'll actually use.

Pros and Cons

Pros

• Combines semiconductor cooling and wireless charging in one device
  
• Clean, no-adhesive clamp system — no residue on your phone or case
  
• Simple, intuitive controls with clear LED indicators
  
• LED can be fully turned off
  
• Excellent MagSafe compatibility for iPhone users
  
• Supports high-power input (9V/3A, 12V/3A)
  

Cons

• ~4 cm contact surface limits overall cooling coverage
  
• Maximum wireless output ~10W — not a fast charger
  
• Priced higher than cooling-only alternatives
  
• No wind baffle means airflow reaches your hand
  
• Raw cooling performance falls short of dedicated cooling-only models

Who Should Buy the Memo CX19

• Use an iPhone 12 or newer and regularly charge wirelessly while gaming or watching content
  
• Want to eliminate the clutter of separate charging and cooling accessories
  
• Prefer wireless charging and are willing to pay for a cooler that supports it
  Stream, record, or use your phone for extended sessions on a desk setup

Final Verdict

The Memo CX19 Phone Cooler is a focused product solving a specific problem: your phone gets hot when it charges wirelessly, and the CX19 addresses both issues at once. It doesn't pretend to be the most powerful cooler on the market, and it's not trying to compete on raw cooling numbers.

What it does well is deliver a clean, convenient experience — especially for iPhone users who can take full advantage of MagSafe alignment. The controls are simple, the build is solid, and the dual-function design genuinely reduces desk clutter.

The price is fair given what's packed inside, but only if wireless charging is actually on your list of requirements. If it isn't, your money is better spent on a cooling-only model.

Know what you need before you buy. If wireless charging matters to you, the CX19 is worth a serious look. If you have any phone coolers requirement, you can expore on our phonecooler.com!