Bluetooth True Wireless V5.0, supported protocols: HSP , HFP , A2DP , AVRCP BT range: up to 30m. Pairing code: 0000. iOS and Android devices supported. Rechargeable lithium-polymer battery; music time: up to 6 Hrs (medium level) on a single charge; Bluetooth standby time: up to 6 days ; charging time: ~ 40 minutes.