Description:A brand-new with a 7-day unconditional refund promise.Bluetooth version: V3.0, compatible with V2.1,V2.0, V1.2Frequency range: 2.4GHz-2.48GHzTransmission power: Class 2Operating voltage: 3.6V-4.2VTransmission distance: Max.10M(open space)Charging time: Max.3HTalking time: About 5HColor: BlackWeight (with the package): 100gPackage Include:1 X Bluetooth Headset2 X Black Headset Earhook1 X User Manual1 X USB Charging Cable