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Description: Supports 4 Audio input mode: receiver, USB decoding play, TF card decoding play and FM radio. Supports play format: MP3, WMA, WAV, FLAC. External power supply interface for lithium battery powered use. Preamp output can directly promote the headset, also can be connected to the use of rear stage power amplifier. Portable and compact size, light weight, easy to use and carry with you. Specification: Material: Metal Size:(Approx).50x40x2mm/2x1.6x0.08 Inch Package Includes: 1 Piece Audio Receiver Board (with microphone) 1 Piece Remote Control 1 Piece Audio Receiver Board (without microphone) 1 Piece AUX Cable Note: 1. Remove the translucent white plastic sheet from the bottom of the remote control before using it, so as to power on in the right way. 2. If you need the FM radio function, please first DIY a long wire as antenna on the FM antenna area.