MRT mPTX: This is a MRT Personal Transponder. This is powered from the receiver, no extra battery power source needed. Choose from hard case tabbed version, or lightweight heat-shrink protected version. Perfect with all AMBrc systems and RC4 up to v4.4 software. (will not work with the v4.5 Drone System update). MRT Pro Transponder, mPTX-ID is 100% Waterproof (Hard case version), common 2-wire design, are lightweight and small in size. This makes them easy to fit into the smallest, tightest areas. The black wire is soft and pliable making them easier to install.

Please review picture for details as this unit works as designed.