Quality audio and performance with durable design.A rugged metal handheld transmitter with powerful features and a Beta 87A cartridge.AD2/B87A delivers impeccable audio quality and RF performance with wide-tuning, High Density mode, and encryption. It features durable metal construction, rechargeable power with dockable charging, and black finish.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.Note: When purchasing separate wireless components, please match their frequency bands to ensure proper system operation.