Decora In-Wall Humidity Sensor for Bathroom Exhaust Fan Control Switch, 1/4 HP,

Replaces an existing switch and can be used with most bathroom or ventilation fans or fan/light combinations. Easy DIY install with slim depth for an easier fit in the wallbox, interchangeable line and load wires to help prevent miswiring, and a green flex sleeve that connects to ground or neutral when the sleeve is removed.