The Tekonsha Trailer Breakaway System with Integrated Multi-Stage Charger is designed to bring a trailer safely to a stop by activating its electric brakes should it become disconnected while being towed. It's designed for use on 1, 2 or 3 axle trailers equipped with electric brakes. The Multi-Stage Integrated Charger provides a fast recharge of the trailer brake battery up to 12.8 Volts. Once the trailer breakaway battery is fully charged, the automatic float mode is designed to provide a continuous charge without overcharging. Push to test LED's provide fast and easy battery testing status and indicate fully charged (Green), charging (Yellow), or recharge (Red). The weather/corrosion resistant, the heavy-duty polymer case of the trailer breakaway kit protects battery and charger. Quick and easy to install, the trailer breakaway kit with battery offers flat surface mounting convenience. Note: Make sure battery is fully charged prior to towing.