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Specification Operating frequency 2.4GHZ-2.480MHZ Comply with the Blue-tooth V4.1 standards Wireless connection range 10 m Headset built-in rechargeable lithium battery 150mAH with 6 hours talk time and 150hrs standby time. Function On/Off Press ON for 4-5 senconds,bluetooth signal light will be on. Press OFF for 3-4 seconds, bluetooth signal light will be off. Bluetooth Pair In bluetooth close status, plz press ON button for 5 seconds,the flash light will be on and you can pair bluetooth In pairing status you can look for bluetooth equipment via mobile with bluetooth function. If you found BT-2 in mobile bluetooth list,then plz put into 0000 to pair.If pairing succeeded,signal light will stop flashing. Low Power Notification In On status,red light flash means power is not enough and need you to recharge. Difficult Solutions Power shortage, or no electricity, please charge in time Please make sure that the volume is not tuned to the lowest volume 0, or that the Bluetooth is not connected to the phone. Check if the USB line is damaged and the connection is correct. Packing List 1Xsmart sunglasses 1Xcarring case 1XUSB cable 1Xcleaning cloth