Alvoxcon Headset Microphone x2, Lavalier Microphone x2, Wireless Dual-Person TG120. Purchased and only used once or twice to test the sound, so it's practically unused. The microphones are unidirectional. About this product: 【UHF Wireless Transmission Technology Wireless Microphone】: Compared to the conventional Bluetooth 2.4G wireless technology, UHF wireless transmission technology uses an independent frequency band and is not interfered with by Wi-Fi signals. At the same time, the UHF wireless transmission distance is longer, and the sound quality is clearer and more stable. The maximum transmission distance is 40 meters. 【Easy-to-Use Wireless Microphone】: Automatic pairing, no difficult operations required. Easy to use even for beginners. Ultra-lightweight design makes it convenient to use and carry. It's a combination of a detachable headset microphone and clip-on microphone, so you can choose according to your needs. The headset microphone can be securely fixed to your head, freeing up both hands. The clip-on microphone is not only easy to wear but also doesn't affect aesthetics. You can easily use it for classes or recording. 【Wide Compatibility】: This product can be used directly with speakers with a mic in terminal (Note: Sound will not be output from Line in or AUX in) to achieve sound amplification. (If sound is not output when using an Android smartphone, please download "open camera.") It is also possible to achieve recording and video recording functions with a camera. Note: This product may not be compatible with computers. If you want to use it with a computer, we recommend purchasing the USB wireless microphone (UM310). 【Troubleshooting】: ➀ If no sound is produced: Check if the RF lamp turns green, if the cord connections are incorrect, and if the receiver is unplugged during playback. You need to check all of these points. ② If noise occurs: Check if there is interference from other wireless audio in the surrounding environment. Note: There is a risk of frequency interference when using multiple units simultaneously, and it is recommended to use each microphone set independently. Thank you for viewing.