Features: Supports 4 Audio input mode: Bluetooth 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: Condition: 100% Brand New Material: Metal + Plastic Type: (optional) #1: Bluetooth Audio Receiver Board + Remote Control #2: Bluetooth Audio Receiver Board Power Supply: 5V DC Audio Output: 3.5mm Audio Output Product Size: Bluetooth Audio Receiver Board: Approx. 4 * 5cm / 1.6 * 2.0inch Remote Control: 8.6 * 4cm / 3.4 * 1.6inch Product Weight: Approx. 15g~28g Package Included: 1# Package Included: 1 * Bluetooth Audio Receiver Board (with microphone) + 1 * Remote Control 2# Package Included: 1 * Bluetooth Audio Receiver Board (without microphone) 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.