Bluetooth Version: v5.1 Bluetooth Profiles: HSP, HFP, A2DP, AVRCP Chipset: JlieLi AB6976D8 Earbuds Input: 5.2V,40mA*2 Charging Case Input: 5.2V, 300mA Impedance: 32Ω Frequency Range: 20-20KHz Operating Distance: 10m Charging Time: 1.5 Hours Playing Time: 5-6 hours Battery Type: Lithium Battery Battery Capacity (Earbuds): 40mAh*2 Battery Capacity (Case): 300mAh