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【Instructions for use】 --Power on: Long press the power button function key for about 3 seconds to power on --Shut down: Long press the power button for about 3 seconds to shut down --Pairing mode: long press the power button for about 5 seconds to enter the pairing state (blue light and red light flashing crosswise) --Previous/Next song: click the volume down/volume up button to cut the song --Volume up/down: long press the volume up/volume down button to adjust the volume up/down --Forced pairing: double-click the play/pause button to achieve forced pairing --Active noise reduction function: long press the function key to turn on/off the noise reduction function --Answer/hang up: click the play/pause button (power button) to answer or hang up an incoming call (note: power button three in one) --Incoming call rejection: When a call comes in, double-click the play/pause button to reject the call 【Note】 --The power button and the active noise reduction button are controlled separately. When you turn off the power button but the active noise reduction button is not turned off, the noise reduction indicator will glow green. At this time, the headset will produce power loss. When turning off the power button of the headset, you also need to turn off the active noise reduction button. 【Specification】 --Unit size: 40mm --Frequency response range: 20Hz-20KHz --Sound pressure level (SPL, 1KHz): 120db --Bluetooth version: 5.0+EDR --Bluetooth chip: Jerry 6925D --Noise reduction effect: -18dB~-25dB --Bluetooth distance: 10 meters --Charging time: about 2 hours --Single use time:about 8 hours --Audio input: bluetooth/wired input --Size: 15*8*17cm 【The package Includes】 --Headphone *1 --3.5mm Audio adapter cable*1 --USB charging cable*1