Support 4-color color spectrum display. Support Bluetooth Bluetooth version 5.0 and hands-free calling. Support AUX, FM, USB, SD. Support power-off memory function: the song and volume played before the memory is powered off can be memorized to the current point. Support MP3/WMA/WAV/FLAC/APE format music. Support USB/SD card/Bluetooth/FM/switch. Support Bluetooth Bluetoot on a song, next song, volume adjustment, play / pause, mute. Turn on the default Bluetooth, if you have a card or a USB flash drive, put music directly. Color: black material: plastic Bluetooth: Bluetooth 5.0 Music format: MP3/WMA/WAV/FLAC/APE Voltage: DC 5V/12V Working current: 600MA-800MA Remote control battery: CR2025 button battery Not included Opening : 83 x 23 x 31mm / 3.3 x 0.9 x 1.2in Mounting hole spacing: 74 x 16mm / 2.9 x 0.6in Panel size : 93 x 30 x 31mm / 3.7 x 1.2 x 1.2in Weight: approx. 288g Package Contents: 4 x Decode Board 4 x Remote Control 8 x Cables Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.