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BTI-850 Wireless transmitter and receiver A, LED light B, On/Off key (Play/Pause on RX mode) C, 3.5MM Audio cable Interface _ transmitter mode D, Micro USB charging port E, 3.5MM Audio cable Interface _ receiver mode Specification: Model No:BTI-850 Bluetooth Version:V4.0,ClassⅡ Frequency:2.402GHz-2.480GHz Receiver working time:About 8 Hours Transmitter working time:About 9 Hours Charging time:About 2 Hours Bluetooth Profile:A2DP/ AVRCP Support dual tream(TX mode):One transmitter connect two bluetooth speaker or Headphone Support connecting with two mobile phone in receiver mode Pass code for supported Bluetooth headset, Bluetooth receiver, Bluetooth speaker etc:0000,1111,1234,8888 Battery:260mAH rechargeable lithium battery Charging supply:5VDC,100-240V AC adapter,≥300MA Working temperature:10-55℃ In charging mode, Red LED on, will changed Blue LED when full charging The entire charging time around 2 hours