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Specifications: Bluetooth version: 4.2 Bluetooth protocol support: A2DP and AVRCP Support multi-format decoding: MP3, WAV, WMA, APE, FLAC Transmission distance: >20M (empty place) Low power consumption: Play less than 20mah, connect standby 0.6-4.5mah, shut down within 2mah Working time: >10H Signal to noise ratio: 95db or more Support one for two: the box (TWS) function (interpretation: one to two is one device connected to two mobile phones, after playback priority; on the box 1 mobile phone with 2 speakers, 1 left channel, 1 right sound Road, left and right channels are separated, or not separated) ------ This function is added after the software upgrade Input / output connection method: A. Receive mode: 3.5MM stereo headphone holder B. Transmitting mode: 3.5MM stereo earphone holder, the computer does not need to connect the audio cable, and the sound is transmitted to the Bluetooth through the USB sound card. Compatibility: The receiving end is compatible with all brands of mobile phones of Android system and IOS system. The transmitting end is compatible with CSR, Chuangjie, Luoda, Zhongxingwei, Ankai, RDA, Jianrong, Jieli and other Bluetooth audio solutions. Size: Approx. 6*2.2*0.9cm/2.36*0.87*0.35in Package List: 1 * Bluetooth Receiver-transmitter 1 * User manual 1 * 3.5MM Audio Cable