Special Features: Version:1.2V Feasible distance:within 10m Weight: 38g Calling tine:9h Engjoying music:8h Standby time:200h Charging time:2.5~3h Standard packing:1. Manual instruction 2. USB cable 3. charger Option accessories:1.Bluetooth dongle Description:The stereo bluetooth designed with very slim & thin and fashionable,weighing 19g of each side scarcely bear any burden for your ear and can not change your hair style