1. 5 channels (3 mono + 1 stereo). 2. USB power supply (DC 5V): computer/power adapter/mobile power supply. 3. Built-in sound card: USB computer direct connection, no driver required. 4. Bluetooth connection. 5. USB playback: MP3, WAV, lossless APE, FLAC. Each mono channel has an +48V phantom power supply Each mono channel has an effect switch. Recording: via USB or PC. Effect: Delay + Repeat. Equipped with two wireless microphones, built-in receiver Microphone frequency:190-290Mhz Colour:Black Material:Metal Package Contents: 1 x Audio Mixer 2 x wireless microphones(1pcs microphone requires 2 x AA batteries, batteries not included) 1 x USB data cable Only the above package content, other products are not included. Note: Light reflection 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.