Battery Capacity For Earphone: 60mAh, 3.7V. 1x Set of Bluetooth Earbuds. Totally wireless high-performance earphones with stable Bluetooth 5.0 connection. Bluetooth Version: 5.0. Bluetooth Protocol: HFP1.7,1.2, A2DP1.3, AVRCP1.6, SPP1.2 and PBAP1.2, BDR/BLE.