Features:Simple and easy to use, with LED screen display.A wide range of device support applications, as long as the device with a microphone interface can be connected.Applicable to teaching, business promotion, stage conference training.Automatic connection, wide application, compatible with audio, amplifier, multimedia, mobile audio.The transmitter is equipped with a back clip for easy carrying.Specification:Frequency offset: 11kHzFrequency response: 50Hz-18kHzFrequency stability: 0.005%Signal to noise ratio: >90dBDistortion: 0.5% (1kHz)Number of channels: two channelsSensitivity: -70dB MUse distance: 50-100meters in the open areaReceiver power supply: DC12V/320mATransmitter power supply: 2 * AA battery (excluding)Transmit power: 20mWFrequency range: 200MHz-300MHzOutput mode: independent and hybrid automatic selectionTransmitter Size: approx. 105 * 65 * 22 mm/ 4.1 * 2.5 * 0.8 inReceiver Size: approx. 104 * 45 * 20 mm/ 4.1 * 1.8 * 0.8 inPackage Weight: approx. 458 gTransmitter:Transmitter battery: 2 * AA (excluding)Frequency stability: 0.005%Carrier output power: 30mWSpurious emission suppression: >40dBModulation method: vhfMaximum modulation: 75KHzPickup mode: (capacitive) (LWM-6188/C)Receiver:Receive sensitivity: <2VImage rejection: >40dBAudio output impedance: 600Audio output level: 0-0.5VUse power: AC 220-240V 50/60HzPower consumption: 1WPackage list:2 x Transmitter1 x Receiver2 x Microphone1 x Adapter Connector1 x USB Cable1 x English Manual.