Description:Wireless: This decoding board works with bluetooth-compatible V5.0 technology, it ensures a stable connection, it supports remote control.Calling: This module supports answering calls, you can long press the pause button to stop answering calls.Audio recording: This voice recorder supports memory card and USB mode only, and it works with a power-off memory function.MP3: This digital music player can be connected to a speaker directly, supporting MP3, WMA, WAV, APE and FLAC formats.Playing: This MP3 player supports file songs. You can play music songs in the file of memory card, pressing the up or down button twice to select songs.Specification:Material: plastic.Color: show as pictures.Size: approx. 11.2*6.1*3.6cm/4.41x2.4x1.42inch.Battery: small controller: 1x CR2025 button battery(not included)Large controller: 2x AA batteries(not included).Bluetooth-compatible: V5.0.Voltage: DC7V-22V.Current: 1-4A.Music format: MP3/WMA/WAV/APE/FLAC.Power: 2x50W.Function: MP3/USB/memory card/LINE IN/bluetooth-compatible/remote control.Note:Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow a slight deviation for the measurement data and make sure you do not mind before ordering.Package Includes:1 Piece Amplifier Board(with 3 Pieces 2P Power Cables, 1 Piece 1P Radio Antenna, 1 Piece Remote Controller).