Wristwatch speaker with bluetooth transmission. The speaker has 3W of power, 2'1 bluetooth transmission up to 10m range, 250 mAh battery capacity, 3-4h charging time, up to 3 hours autonomy, built-in play/stop button and SD card slot . This promotional product is compatible with all devices that support bluetooth transmission. Includes USB/micro USB Cable. 47 x 24 x 70 mm