Shure PGXD2/BETA58=-X8 Digital Handheld Wireless Transmitter with BETA58A Microphone The PGXD2/BETA58 Handheld Wireless Microphone Transmitter works with PGX-D Digital Wireless Systems. Note: when purchasing separate wireless components, please match their frequency bands to ensure proper system operation Pairs with Pgxd4 receiver (not included) With an interchangeable BETA58A microphone cartridge, the PGXD2/BETA58 transmits wireless audio with pure digital clarity and rock-solid reliability. Power, mute, and battery status LED Battery life: up to 9 hours. Battery requirements: 2 AA Alkaline or rechargeable batteries Typical operating distance: 200 ft. (60 M) 10 dB of adjustable gain Lockable interface prevents accidental setting changes Rugged Construction for reliable performance Show after Show