AUX Input and Built-in microphone.The first mode is 3.5mm audio input.It can block out the outside world. The second mode is the built-in mic. It captured the sound of the outside world. The Sensitivity of two modes can be easily adjusted. Suit For led Strip and LED Matrix Panel.Compatible with many LED driver IC except the no IC chip led strip. It is also suitable for many DIY projects.You can set up number of segments and pixels number of each segment according to the LED pixels array of your lights. This feature is perfect for LED matrix. or other DIY project. Adjustable. The speed, the brightness,the number of pixels,color order and the sensitivity are adjustable. When you connect SK6812-RGBW LED, the pure white channel can be adjusted individually. [User-friendly design] IOS and Android smartphone app control via Bluetooth. Compatible with many LED driver ICs, such as WS2812B, WS2811, SK6812, WS2813, SK6812-RGBW etc. Support setting IC types, R/G/B sequence. Save user setting when power off size:85mm*45mm*22mm Material:plastic colour:white Package Contents: 4 * SP107E music LED controller 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.