Timeguard Automatic Light Switch with Photocell - 2 WirePermissible Switching Loads: 2000W Halogen, 250W Fluorescent (Low loss or Electronic ballast), 250W CFL (Electronic ballast), 400W LED lighting. Turns room lights ON at dusk and OFF automatically up to 8 hours later or until dawn (adjustable). Replaces existing One or Two Way light switches 2 wire. Manual ON OFF Switch. Supplied with 9V battery. Concealed front panel with retaining screw. Low battery alert LED indication. Adjustable lux (Light level)