It features a motion detector that senses when you're nearby as far as 12-feet, and automatically turns off when you enter and off when you leave. Even more, the detection system will let you know if the seat is up or down by glowing red if the seat is up and green if the seat is down. Attaches securely and quickly with no tools. Attaches securely to any toilet lid. Requires 2 x AA batteries, which are not included.