Features: ZK 502HS Microphone Sound Integration Machine power Amplifier board; 2.0channels (50W+50W) Support wirelessly microphone (need to bring receiver), condenser microphone, dynamic microphone. TPA3116 Control,can be inserted into two set of receivers at the same time, or choose 1 to 2 wireless microphone. Recommended to use the wireless microphone with receiver, the bottom noise is smaller. Protections mechanism: over-voltages, under-voltages, overheating, detection protections Specifications: Product Name：Microphone Sound Integration Machine Product Model: ZK 502HS Chip Model: Original TPA3116 Wireless Transmission distance: 15meters Input: Wireless+AUX input+USB+MIC Number of channel: 2.0channel (50W+50W) Adapt power supply: DC12-24V/8A Applicable speakers: left and right channel 20-50W4-822 Package Includes: 1Set ZK 502HS Audiory Amplifier Board note: Due to the different monitors and light effect, the actual color the item might be slightly different from the color showed on the pictures. Please allow 1-2cm measuring difference due to manual measurement.