Features: Compact size 4-channel mixing console with LED display, lightweight and portable, suitable for home karaoke, network live broadcast, music recording, etc.  2TR IN RCA jacks can be used to input stereo sound source, 2 STEREO(L,R) IN jacks are used to connect external recorder, with 2 MAIN OUT(L,R) jacks for stereo output.  With GAIN，PAD, EFF, PEAK, HIGH frequency, LOW frequency, LEVEL control knobs, allowing you to modulate more excellent sound effects.  Connect to a computer with USB cable via sound card jack, the signal from the STEREO L/R buses is output to the computer. It can play the signal from the computer to the MP3 buses.  Other features: +48V phantom powering is supported, USB port for connecting MP3 player, 3.5mm headphone jack for monitoring, also support connect with your smartphone via BT.   Specifications: Model: L-4;  Color: White;  Material: Plastic;  Power Supply: +48V phantom power or power adapter;  Package Size: 21 * 17 * 7cm / 8.27 * 6.69 * 2.76in;  Package Weight: 696g / 24.55oz;   Packing List: 1 * Mixing Console;  1 * Power Adapter;  1 * User Manual