When you think about wearable smart devices that aren’t watches, your mind probably doesn’t go to air conditioners. But that might change with the latest version of Sony’s Reon Pocket line, the Pocket Pro Plus. This new model brings stronger cooling performance and a more stable fit than earlier models like the Reon Pocket 5. 

If you’ve never seen one before, the Reon Pocket goes beneath your shirt collar and uses advanced thermoelectric technology to regulate your body temperature. It’s called the Peltier effect, which works using an electrically cooled metal plate that sits against the skin near the base of the neck. Because of its connection to the body’s circulatory system, cooling that area helps you feel the effects more easily compared to a neck fan.

The biggest upgrade with the Pro Plus is its cooling power. The new model delivers temperatures up to 3.6 degrees Fahrenheit cooler than the previous version. Other features include its two thermo-modules alternate intensity for more continuous cooling. Updated sensors now automatically adjust temperature based on your surrounding conditions and activity, as well. In addition to the “Smart Cool” mode, there’s also a “Smart Warm” mode for when the weather changes.

Because of the Peltier effect, the Reon Pocket has always worked by changing the temperature of the contact surface itself… not with fans, like Dyson’s version. But with the Pro Plus, there’s a new built-in fan that circulates air behind the neck to better disperse temps. Basically, it’s all the advanced tech of a Reon Pocket with an extra boost from a mini fan. The updated Reon Pocket Pro Plus also includes redesigned neck fins for better stability over previous models.

Battery life is another big difference. The new Pro Plus can run for up to 15 hours in “Smart Cool” mode, or up to 10 hours on one of its higher cooling settings. You can make temperature adjustments using the device’s physical buttons along the sides or though the companion Reon Pocket app. The Reon Pocket Pro Plus is currently only set for launch in the United Kingdom and parts of Europe, with a U.S. release date yet to be announced.