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IntroductionThis is a Bluetooth transmitter and receiver 2 in 1 adapter, when used as a Bluetooth transmitter, it can transfer the music on your mobile, Walkman, TV, computer, etc to your Bluetooth receiver, Stereo Bluetooth headphone and Bluetooth speakers, etc, through wireless technology. When used as a Bluetooth receiver, it can been a stereo Bluetooth headphone(by plugging headphone audio cabke into 3.5mm port), or connecting with speaker to receive audio signal through wireless Specifications: Bluetooth specification:Bluetooth 4.1, Class II Operation frequency: 2.402-2.480GHz Supported profile: A2DP/AVRCP Operation range :UP to 10 meters Support Dual stream TX Working time(AUX):About 9 hours RX Working time(AUX):About 8 hours Battery type 3.7V, 260mAh Lithium polymer Battery Charge time : About 2 Hour Operating temperature: -10-55℃ Working in TX and RX mode 1, Make the Bluetooth speaker or Bluetooth headset in pairing mode. (Status: Red and blue lights flashing alternately) 2, Connect it to your device with 3.5mm audio cable, and press "ON/OFF" key around 3 seconds until Blue LED flashes quickly enter into searching mode, if it does not enter into pairing mode, press "ON/OFF"key once or restarting it enter into pairing mode. 3, It could hear the sound coming from computer in the Bluetooth headset or Bluetooth speaker, if no sound comes out. Please check the aux output setting on computer (Headset output), the volume of the computer is loud enough or the cable connects right or not. (Please refer to the manual for the details).