▼Bluetooth funtion ▼ Classical double echo effect, more comfortable singing. ▼ LCD screen is easy to set the data. ▼ Single reverb and stereo can switch . ▼ With feedback function. ▼ 5.1 balanced outputs, can be flexible with power amplifier. ▼ With center and surround output channels, volume can be adjusted independently. ▼ SUB channel frequency: 45—250Hz, auto decay, decay rate is adjustable. ▼ 3 bands EQ is for MIC, effect and music. ▼ Initial and max volume are for music and MIC.