Bluetooth version: bluetooth V4.1 Playback time: 3 H Standby time: 120 h Range: 10 m Function: Listen to the phone number two, support listening to music and call, We will be able to use the telegram number, the final call, the all-intelligent Chinese and English voice prompt, turn on, and turn off the phone. There is electricity in IOS, which shows you can watch your headphones at any time and you don't have to worry about your headphones. The bluetooth headset will automatically return the phone to the phone when it is turned off. Smart compatibility: support all bluetooth enabled phones, tablets, notebooks, songs, music, movies, etc. Note:It is recommended not to turn the volume to the maximum Package included: 1 x Bluetooth headphone 1 x cable