The TORK A530M 30-Minute Spring-Wound In-Wall Twist Timer with an ivory faceplate is designed to control a variety of indoor appliances and lights. Automate your home or office to save energy and money using the simple twist knob and reliable mechanical timekeeping. Fits into a standard electrical box for in-wall mounting. Designed for indoor loads such as lights, whole house fans, air compressors, water heaters or motors.