Shure BLX2/B58 Handheld Wireless Microphone Transmitter | Frequency: H10 (542-572 MHz)The BLX2 B58 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 a short time. It's also a good choice for when you need one mic source for multiple people, such as in a Q&A session or discussion panel. Note: When purchasing separate wireless components, please match their frequency bands to ensure proper system operation.