Review on Enhanced by-WM4 Pro K2 2.4G Wireless Microphone System: Dual Transmitters + One Receiver, Perfect for DSLR Camera, Camcorder, Smartphone, PC, and Tablet Sound Audio Recording Interviews - Includes Hard Case by Garrett Craven

I bought these Boya WM4s and they worked very well with my Iphone 11 for 3 weeks. Last week one of the transmitters stopped working, I changed the batteries every week and one of the transmitters stopped working at all. I tried to connect them according to the instructions but it still didn't work. I used a transmitter and then the receiver stopped working. It was a disappointing experience. I spent over $150 and the mics stopped working on the 4th week. I used the Boya set 2 times a week for an hour. Don't waste your money. They are unreliable and will fail at any time. I am extremely disappointed.