Quantity:1pcColor: BlackSpecifications:Supporting edition : 2.1Frequency range : 2.4GHz - 2.48GhzTransmission distance : 10MEnvironment : working : -20 ~ 60Temperature: Charging : 0 ~ 45Operating voltage: 3.6VOperating current : ≤ 25mAStandby current : ≤ 1mACharging time: 2-3 HTalking time: ≤ 2HStandby time: 60 HHigh efficiency， high performance， lightweight Li-poly batteryBluetooth v2.1 ， compatible with any Bluetooth enabled mobile phone