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Specifications Colour options: Blue/ Orange Speaker diameter: 40mm Speaker impedance: 32ohm S.P.L.: 106Db S.P.L. at 1KHz Frequency response: 20HZ-20,000HZ Battery capacity: 400mAh Battery type: Lithium battery Charging time: 3 hours Operating voltage: 3.7V Charging voltage: Below DC4.7V-6V Line-in cable length: Approx. 1.2m / 3.28ft Please Attention: 1) A bluetooth adapter is necessary when use B3506 on PC, 2) Connect audio cable with headset, if sound is unclear, only one side have sound or microphone doesn't work, please switch the IP/ NK key. ( IP: international standard, NK: national standard )