AD2/B87A delivers impeccable audio quality and RF performance with wide-tuning, High Density mode, and encryption. Features durable metal construction, rechargeable power with dockable charging, and black finish.Two transmission modes: Standard for optimal coverage and new High Density for maximum system channel count and robust coverage. * Rugged metal construction in black finish * Backlit LCD with easy-to-navigate menu and controls * Low-profile, lockable power switch * Encryption-enabled, secure transmission * AA or SB900B lithium-ion rechargeable batteries for convenient power options * External contacts for docked charging The AD2/B87A is a handheld wireless microphone transmitter compatible with Axient Digital Wireless Systems. With breakthrough RF performance and wide tuning up to 184 MHz, the AD2/B87A puts professional-quality wireless digital audio within reach.  G57 frequency band. Note: When purchasing separate wireless components, please match their frequency bands to ensure proper system operation.