Review on Songhe FM Transmitter Pickup Module - Mini Wireless Microphone for FM Emission - Wireless Audio Transmitter MIC Core Board V4.0 by Mysocalled Gaultier

I bought 2 of these. I couldn't get them to stay on frequency because every time you put your hand over it the frequency changed a lot making it very difficult to get it right. They can work well as an FM bug or baby monitor where you can mount them and not touch them during use, but they don't work well as a portable FM microphone due to frequency drift if your hand gets close to them. . Ok for the money, but not outstanding.