Men's sleeveless heated down jacket with Bluetooth cable, ideal for enjoying your outdoor activities! The jacket's 5 heating zones provide gentle, even warmth. Extremely thin and light, it can be easily integrated under other clothing. Works with all external chargers (PowerBank included). The U-Pack USB cable enables you to activate the jacket's Bluetooth Therm-ic so you can control its heating function via the Thermic Heat Control app (when the jacket is not connected to the app, the heating power will be at its maximum. By connecting the jacket to the app, you can control the heating power by choosing an appropriate setting). How to use: Connect an external charger/PowerBank to the USB cable inside your pocket and slide it inside the jacket.