The gem remotes 3 button new style transmitter has a 3 button transmitter for remotes made after 2006. Easily programmable to your gem remote with the exclusive learn button. Up to 16 transmitters can be added per remote. The gem remotes 3 button new style transmitter floats if it is dropped in water and runs on radio frequency. It comes with 2 - 3 volt batteries. The remote size is 2.8" x 1.8" and has a key chain loop on the remote to easily add to boat keys or personal keys. All gem remotes work with any BH-USA hoist. If you have any questions on if your system needs the old style 2 button or if you need the 3 button new style, then you can contact us and we will try to assist you in getting an answer.