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Wireless Version: V5.0+EDR Blue tooth protocol support: HFP HSP A2DP AVRCP Receive connection: 2 Working voltage: DC 3.2-4.2 V Working current: < 15mA Built-in lithium battery: 60mAH Working time: 4 hours Charging time: 2 hours Temperature range: -10°C to +70°C Wireless transmission range: about 10 meters Transmission power: CLASS2 Frequency range: 2.4GHz-2.480GHz External interface: 3.5 Audio plug, 3.5 audio socket, MK USB plug Product size: about 13.3(L) *12.9(W) *73.8(H) mm/0.52(L) *0.51(W) *2.91(H) in Package Includes: 1 x Bluetooth Receiver 1 x 3.5mm Audio Adapter 1 x Charging Cable 1 x User Manual