Bluetooth 4.2 remote sound transmission. True Wireless Stereo, Rich multifunction catches, Supports iOS battery level display. Water-evidence and sweat-proof,12Hours of ceaseless play, one charge can be played for 3 hours, and the charging box can give an additional 9 hours to headphones. Mini body, simple to stow away, Magnetically battery-powered box, simple to convey. Transmission mode: Bluetooth4.2, Port Micro: USB, Support Voice Calls: Yes.