Marinco Guest On-Board Battery Charger is easy-to-use and fully waterproof. Each Guest charger has a fully-automated 5-stage charging as well as sensing and control for every bank. The status of the banks is monitored and indicated throughout the charging process. Designed for all 12V flooded and AGM lead acid batteries, installation is simple with each model being pre-wired. Includes an automatic energy saver mode and LED charge status monitor. Specifications:• Amperage: 20A• Voltage: 12V (output)/120V (input)• Banks: 2• Waterproof rating IP67 Pre-wired for easy installation For fresh and saltwater applications | Guest On-Board Battery Charger, 20A/12V