The BLX1 Bodypack Transmitter from Shure is designed for use with Shure's BLX wireless systems. It is set to the J10 frequency band and operates between 584 and 608 MHz. It has a TQG input and can be used with Shure lavalier, headset, earset and instrument microphones. With the optional WA302 adapter cable, the BLX1 can be used as a transmitter for guitar. The unit has a top panel mounted on/off switch as well as volume control for quick access while speaking or performing. The BLX1 is powered by the two included AA batteries for up to 14 hours.