Introduction: This mixer is a compact, powerful mixing console, which can meet your needs for the occasions such as daily-life small-scale concerts, family music making, Karaoke replay, network broadcasting or Karaoke, etc.. Features: The mixer had up to 4-channel inputs with built-in 48Vphantom power, a high-impedance guitar amplifier, a blue-tooth/MP3 player, a computer sound card, an effector, etc..It has a compact size, easy for carry, and can be supplied with power by asing a computer/movable power source or an adaptor. 1. Mixed Mic./Line Input in Mono input channel 1/2: To link the mike and other audio devices, supporting a cannon plug and a 6.35mm plug. 2. 48V Phantom Power Switch/Indicator: Press down this switch, the 48V phantom power indicator will light up. Then supply the direct 48V phantom power to the cannon port for the use of the condenser mike. 3. Guitar/Line Input Switching Switch in Mono input channel 2: To switch between different sound sources input into the 6.5mm jack in Channel-2. Press down the switch, Channel-2 can be directly connected to a high-impedance sound-source device, such as an electro-guitar and a bass. When this switch bounces up, it can connect the low-impedance sound-source devices. 4. Gain Knob: Adjust the amp factor of the amplifier to match the sensitivity of the input signals. 5. High/Low Sound Knob: High-quality two bands of sound tones. For tuning the sound color of the sound. 6. Effects-Sends Key: Press down this key, the channel sound is sent to the built-in effector of this device. 7. Volume Knob and Peak Indicator: Adjust the volume sent to the main output and the earphone through the channel. If the peak.indicator lights up, it shows that the signals appear to be distorted. You may turn the gain knob to the left, to reduce the signal gain. Note: The knob function of the gain, the tone and the volume in the stereo input channel is the same as the Mono input. Please refer to this note. Winmix 4-Channel Audio Mixer Console with UHF Wireless Microphone Kit Bluetooth USB Audio Interface,for DJ Karaoke PC Guitar