The Shure BLX2/SM58 Handheld Wireless Microphone Transmitter with SM58 Capsule is a handheld wireless microphone transmitter compatible with BLX Series receivers. It comes equipped with the legendary SM58 cardioid dynamic capsule, an industry standard for vocalists and announcers. The capsule features a cardioid polar pattern that minimises background noise and feedback. Its brightened midrange and bass roll-off deliver that sought-after warm and clear vocal reproduction. The built-in spherical wind and pop filter reduces plosives for clean and intelligible speech. With a lightweight, ergonomic design, the BLX2/SM58 is comfortable to hold. It provides up to 14 hours of continuous use with the two included AA batteries, at a range up to 300'. Group and channel selection buttons allow for quick and simple frequency matching with the receiver. Other features include an easily accessible on/off power button, adjustable gain control, and a black identification cap. The WA621 Colour ID Caps kit containing assorted coloured caps is available as an optional accessory. Specifications System Wireless Transmission Analogue UHF RF Frequency Band H9: 512 to 542 MHz RF Bandwidth 24 MHz Max Operating Range 300' / 91.4 m (Line of Sight)