Audio Mixer Specification:Color: BlackInput Mixer Channels: 4 ChannelsBluetooth Connection: YesUSB Input: YesPC Connection: YesDisplay: LEDPhantom Power Voltage: +48VPower Supply: 100/240VCompatible Device: Mobile Phone / ComputerMaterial Type: Plastic + MetalInput: -60dBm~-40dBmCommon mode rejection: -70dBOutput voltage: 6V MaxSignal to noise ratio: 80dBTotal harmonic distortion: Less than 0.03% (at 1KHz)Frequency response: 20Hz-20KHz 3dBHeadphones: 7V/220 Eq parameters:Hi 15dB/12KHzLow 15dB/80KHzVoltage supply: AC100-240V/50-60HzWireless Mic Specification:Color: GoldTransmitter Type: HandheldMicrophone Type: DynamicOperating Range: 30 metersBattery Type: LithiumWireless Technology: UHFCompatibility: Mixers, amplifiersWireless microphone frequency band: 541.5-570 MHzPackage Information:1x 4 Channel Mixer2x Wireless Mics