With Standard Lotus Socket External Sound Input,it Can Be Connected to Computer,mobile Phone and Other Audio.You Can Choose Full Frequency Or Low Frequency Output,there Is No Human Voice Output in Low Frequency (LPF) State.With Short Circuit Protection and Reverse Connection Protection,double Insurance Design,although You Can Use It With Confidence and Boldness.The Built-in Squelch Circuit Can Eliminate Some Noise,making the Sound Quality more Beautiful and more Pleasant.colour: as shownMaterial: PC+metalPackage Contents:1 x Car Amplifier Board(Due to different batches, the appearance of the product may be different, but the function is the same)Only the above package content, other products are not included.Note: Light 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.