1. UHF wireless handheld microphone - The signal in the UHF band is stable, built-in multi-frequency point setting. 30 frequencies are optional, and multiple units will not be cross-frequency. 2. Real-time audio monitoring - Enhanced headphone monitoring function, allowing you to monitor in real time while shooting. 3. Handheld microphone - The pickup is more accurate and the sound is more delicate. The microphone can be matched with customized decks. It can effectively attract the attention of the audience. And it is suitable for interviews, live broadcasts, etc. 4. Easy-to-read LED screen - The transmitter with LED display can display battery status, channel and other information. 5. For camera or smartphone - The receiver with 3.5mm interface, with 3.5mm cable, can be used with laptop/PC/DSLR camera/amplifier/DV/camcorder/smartphone/mixer, etc. Universal battery - The receiver and transmitter both use 2x1.5V AA batteries, and the working time is 4-5 hours. Wireless transmission, Signal stability in UHF band. Pay attention to before using this product: 1. The package contains two cables, cell phone cable and camera cable (do not use it wrongly). 2. The white label cable port is connected to the phone or camera. 3. When the volume of the transmitter is turned on half, the noise will be smaller. 4. Select the appropriate frequency. 5. When connecting the camera to use, turn off the camera's noise floor. Explanation about the volume knob of DV series receiver: The volume knob of the receiver of this product is hidden. 1. Because we designed it to be connected to the camera At that time, the volume is not adjustable, because the setting volume of the camera dominates the volume control. 2. For the concise design of the product. We are equipped with a small adjustment stick, which can be used to adjust the volume of the receiver. The volume adjustment is mainly set on the transmitter, you can easily adjust the volume, so please understand our intention. thank you. Col