11 with 1 wireless microphone, noise reduction chip, effectively identify sound that needs to be recorded, and the reception effect is very clear. 2Highperformance wireless transmission technology, can pass through wall, unlimited recording, effective transmission distance is 50m/164.0ft 3Builtin 500mAh lithium battery can be used continuously for 4.5 hours, using USB charging interface design. 4Easily competent in a variety of scenes such as teaching, video recording, live online class, and longterm shooting. 5Automatic connection at start up, no need to manually match, simple and fast. Item Type:Lavalier Microphone System Material:Plastic Color: Black Weight: Approx. 186.0g/6.6oz Carrier Frequency Range: 470MHz~960MHz Pause Rate Stability: 0.005% Effective Working Distance: 50m Audio Companding: ForDSP Digital Audio Companding Audio Sampling Rate: 48KHz Audio Frequency Response: 50Hz~1800Hz3dB Dynamic Range: 92dB Signal to Noise Ratio: 105dB Total Harmonic Distortion: 0.8%, @1KHz Working Temperature Range: -10~+50 Transmitter: Carrier Bandwidth: 470MHz~960MHz Oscillation Mode: ForPLL Frequency Synthesis Transmit Power: 13.5dBm Carrier Rrror: 0.005% Harmonic Radiation: -32dBm Modulation Method: FSK Nominal Maximum Frequency Deviation: 65KHz Maximum Input Level: 250mV Input Impedance: 2.2K Frequency Setting: Manual button to set the frequency point Power Supply Mode: Built-in Lithium Battery 500mA Endurance Time: 4.5 hours when the battery is fully charged Receiver: Receiving Bandwidth: 470MHz~960MHz Receiving Method: Single Channel, Superheterodyne Image Rejection: 45dBm RF Sensitivity: when input 10dBu, S/N45dB Squelch Adjustment: Built-in Setting Parameters Frequency Synchronization Method: Manual Button Search Settings Maximum Output Level: LNE: 0.5Vpp Power Supply Mode: Built-in Lithium Battery 500mA How to use: 1. Long press the power switch for 2 seconds, after power on, the pairing connection can be successful (it has been paired before leaving the factory) 2. Clip the transmitter to the collar of the user, or connect an external microphone 3. Before installing on the camera, after creating a certain space between the back clip of the receiver and the receiver, push the receiver into the camera shoe slotto fix it 4. If using the camera's external microphone, connect one end of the 3.5mm output cable to the output jack of the receiver, and the other end of the 3.5mm output cable to the camera "audio input" jack 1 x Receiver 1 x Transmitter 1 x Charging Cable 1 x Manual