1> Bluetooth compliance: bluetooth V1.2 2> Frequency band: 2.45 Ghz ISM band 3> Channels: 79 channels frequency hopping 4> TX output power: class 3(OdBm) 5> receive sensitivity: less than 82dBm typical operating. 6> operating range: up to 10 meters (33 feet) 7> operating temperature: -10-60C 8> security: encrypted link 9>typical talk time: up to 6 hours 10>typical standby time: up to 150 hours 11>typical charging time: approximately 2 hours 12>charging interface: 6V DC adaptor 13>indicator light: red and blue LED light 14>dimension: 64mm(L) x 28mm(W) x 30mm(H). 15>weight: 16g 16>pairing mode: point to points 17>drop test: it works normally after 1.5M drop testing by 10 times 18>microphone type: Omnidirectional 19>Li-Battery: 150mA 3.7V 20>Press key: CALL, VOL+, VOL- 21> other function: voice dialing