Radial BT-Pro Bluetooth Receiver 2-channel Active Direct Box Bluetooth reception to 12 meters (40 feet!) Dual balanced XLR outputs to connect to PA system Built-in headphone amp for troubleshooting Isolation transformers to eliminate buzz and hum The BT-Pro is a Bluetooth direct box designed to capture the wireless transmission from a Bluetooth enabled device and convert the signal to a balanced line for use in a PA or recording system It employs an innovative T-shaped access cavity behind which is located the antenna This is protected by a milled insert made from Sintra  a rugged closed-cell PVC - that permits the wireless transmission signal to pass without interference, allowing reception distances of 12 meters (40') or more with line of sight between devices The audio signal path itself employs the latest Bluetooth wireless A2DP interface over 2