Warm Tips & 1 Year Warranty: Please read the user manual and charge the wireless lavalier microphone before using it for the first time.You need to take off the receiver to be able to hear the audio playback. Contact us if it doesn't work. We provide 1 year warranty and 24 hours consult service. Feel free to contact us if you have any questions. Long Distance Transmission & Long Battery Life: Upgraded wireless microphone transmission technology, 65 feet stable audio signal transmission without cable and harsh noises. The reciever is powered by your device(Can Be Charged At The Same Time), the transmitter built in rechargeable batteries works up to 4-6 hours. Superior Noise Reduction & Real-time Auto-sync: This omnidirectional wireless lavalier microphone is built with professional-grade intelligent noise reduction chips, providing effective identification of the original sound and clear recording in noisy environment. The real-time auto-sync technology extremely reduce the time of video post-editing, supporting a better experience in videos being watched. Plug and Play & Auto Pairing: Turn on the power switch of the receiver and microphone, then plug the receiver (USB-C/3.5mm/USB) on your devices, they will automatically connect. No Driver, Bluetooth or App needed. If the mic is not recording sound, please change the default microphone on your device. 4 in 1 Wireless Lavalier Microphones: upgraded 4 in 1 universal receiver with USB-C/3.5mm TRS/USB Plug, it is compatible with iPhone/iPad/Android Phone/Camera/Computer/Laptop/Macbook, etc. The receiver can connect two microphones at the same time.