Feature: 1. High Sound Reproduction: Our wireless miniature microphone receiver amplifier kit uses a condenser microphone core to achieve 99 percent sound reproduction of the instrument. 2. Stable Signal Transmission: Our wireless miniature microphone receiver amplifier kit allows a total of 16 UHF channels to be selected, allowing multiple microphone systems to be used simultaneously without signal interference. 3. Easy to Use: The transmitter has a spring loaded clip with silicone that will not damage the paint. Clip the transmitter to the side of the violin, plug the receiver into the microphone of the speaker, then turn it on and use it. 4. High Capacity Lithium Battery: Our wireless miniature microphone receiver amplifier kit transmitter and receiver has a built in 600mAh battery that can be recharged 2000 times and can be used continuously for more than 6 hours after charging. 5. Widely Used: Our wireless miniature microphone receiver amplifier kit can be used for soloist's performance, backing performance, individual entertainment, group performance, you can make this kit have excellent performance according to the actual situation. Specification: Item Type: Wireless Miniature Microphone Receiver Material: Plastic, Electronic Components Receiver: Frequency Range: UHF 660-690MHz Frequency: Preset 16 optional channels Modulation Mode: pi/4 DQPSK Delay: <6ms Sampling: 48KHz Frequency Response: 60Hz-15KHz±2dB Total Harmonic Distortion: <0.8% (1KHz) Signal to Noise Ratio: >92dB Receiving Sensitivity: -92dBm Output: 6.35mm plug Power Supply: 1 x 3.7V Lithium battery 702535/600MAH (shipped with built in battery) Power Consumption: > 6 hours of continuous use Transmitter: Frequency Range: UHF 660-690MHz Modulation Mode: pi/4 DQPSK Transmitter Power: 10mW Sensitivity: -47 dB±2dB Frequency Switching: IR to frequency Microphone Core Type: Capacitive (super cardioid) Power Consumption: > 6 hours of continuous use Specification: 100-240V. Package List: 1 x Receiver1 x Transmitter1 x USB Charging Plug1 x Charging Cable1 x 6.35mm to 3.5mm Conversion Plug1 x Instruction Manual1 x Storage Box1 x Antenna