Bluetooth specification)：Bluetooth 5.0 Chip：AC7006F Pairing name：ANC-Headphone Support agreement：HFP ，A2DP，AVRCP Effective range：10 m Working frequency：2.402 -2.480GHZ Transmission power：CLASS 2 Charging voltage：DC 4.75-5.25V Charging current： 350 ｍA Charging time：2.5 h Operating current：≤ 25 mA temperature range：-20ºC to +60ºC Call time：About 12 h Play time：About 15 h Standby time：About 19 h Static current after shutdown：About 1 uA Maximum Paired Number：2pieces Feature: BT5.0, Audio Sharing