USD 1.73/pieceUSD 2.92/pieceUSD 0.70-1.62/pieceUSD 0.76-1.85/pieceUSD 2.43/pieceUSD 2.46/pieceUSD 4.87/pieceUSD 4.18/piece Pairing timeout shutdown: shutdown after 5 minutes of pairing status Low voltage reminder: when the voltage is less than 3.2v, it is reminded every 5 seconds, and 3.1v is off System status: Power off: MFB long press for 3 seconds Volume up: short press VOL+ Volume reduction: press VOL- Switching languages: double-click and hold MFB in the pairing state (red and blue lights flashing) Music control: Play pause: press MFB Last song: VOL- press for 2 seconds Next song: VOL+ 2 seconds Telephone control: Answer the phone: press MFB when calling Reject the call: the duration of the call is MFB Unsigned redial: double-click the MFB key, then press MFB to cancel the dialing Led display: Power-on pairing: red and blue lights flashing alternately Connection status: blue light flashes slowly (5 seconds 1 time) Low voltage: red light flashing (0.5 SEC 1) Working current: Status parameter (4.00v) (3.40v) Rated operating voltage 4.00V 3.40V Matching state current 4.33 ma-20.56 mA 4.47 ma-22.03 mA Standby current (bluetooth connected) 0.43 ma-8.31 mA 0.41 ma-8.74 mA Play music current 19.04 ma-23.21 mA 22.85 ma-23.74 mA The call current is 23.82 ma-24.05 mA 25.19 ma-25.78 mA Charging current 100.0mA. 100.0mA Power off current 1.4uA 1.1uA This kind of bluetooth noise-reducing answer, supports any key to answer, connects effectively with the smartphone, automatically matches the connection program, and maintains the connection state when charging. – sound insulation, high definition call: identify sound frequency through intelligent control chip, and generate reverse signal to filter out external noises (noise and wind) within the range of non-human voice frequency. High definition calls in any noisy environment. Very beautiful sound quality gives you different enjoyment!