Check the listing for details. Wooden Camera A-Box. Condition: Used. Listed at 100.00 USD. A-Box allows for two XLR microphones to be plugged into any camera having a single 3.5mm input (also referred to as 1/8" or mini-jack). This system includes the highest quality professional grade connectors included within the box. Comes with Bolt On 19mm Rod for attaching to any 1/4-20 threaded hole and 15mm Adapter Bushing for clamping to 15mm rods. This adapter does not provide phantom power to connected accessories.