Shure BLX2/PG58 Handheld Wireless Microphone Transmitter | Frequency: H9 (512-542 MHz)The BLX2 PG58 from Shure is a handheld wireless transmitter that's ideal for singing and speaking applications. It's particularly useful for occasions where multiple people need to be miked for short periods of time, or when you need one mic source for multiple people, such as in a Q&A session. The transmitter comes with two AA batteries and a mic clip.