Features: The body is small and easy to carry;  UHF global unlimited frequency band transmission;  Widely compatible with computers, digital or SLR cameras, camcorders, voice recorders, tablets, mobile phones;  Built-in electret microphone, but also supports external lavalier microphone.  Back clip: The product can be directly clipped to the SLR hot shoe for use.  Automatically connect and connect when booting;  When the transmitter or receiver is not connected, the device will be automatically turned off within 2 minutes.     Specifications: Transmission frequency band: UHF Transmission type: automatic frequency;   Transmit power: 10dBm;  Receiving sensitivity: -86dBm;  Antenna mode: external antenna;  Microphone pickup method: cardioid;  Power supply requirements: built-in lithium battery, charging via standard USB 5V with TYPE-C interface;  Audio frequency response: 100Hz ~ 20KHz +3dB;  Battery life: 5 hours;  Dynamic range: 90dB (Electrical performance);  Output interface: 3.5mm TRS;  Signal to noise ratio: 97dB (A weighted);  Working temperature: -5°C~+50°C;  Maximum input sound pressure: 97dB SPL;  Dimensions: 8.5*3.5*2.5CM;     Installation method: 1. Turn on the switch to the right, the pairing can be successful after the indicator light is on.  2. Hold the transmitter in your hand, or clip it on the collar of the user, or connect a lavalier microphone.  3. Before installing it on the camera or mobile phone, push the receiver into the camera hot shoe bayonet to fix it.  4. If using a lavalier microphone, connect one end of the 3.5MM output cable to the output of the receiver, and the other end of the 3.5MM output cable to the audio input of the camera or phone.     Package Contents:  1 * Transmitter;  1 * Receiver;  1 * Lavalier microphone;  1 * USB Charging Cable;  1 * Windproof wool cover;  1 * Dual head 3.5 adapter;  1 * 3.5mm Camera extension cable