Description: Stable Signal: Various Bluetooth-compatible devices, it has a stable signal. Fast Connection Speed: Powerful, fast connection speed, faster music playback. Excellent Performance: Fast transmission speed, it has Excellent performance. Premium Material: Made of plastic material, which is light and portable. Wide Application: Supporting various devices, such as mp3, mp4, mobile phones. Specification: Color: As Shown Material: Plastic Size: Approx.5.1x4.1x0.5cm/2.01x1.61x0.20 inch Audio Source Input Mode: 1.Bluetooth Reception 2.USB Decode and Play 3.TFCard Decodes and Plays Support Playback Format: Mp3, WMA, WAV, FlAC, APE (Only Support Ape Fast Encoding Format) Power Supply: 5VDC (Original Phone Charger Can Power Small USB Plug). The Front Output Can Directly Push The Earphone, or Can Be Connected to The Rear Power for Amplifier. Note: There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece for Amplifier.