Intermatic EJ500C EI500WC in-Wall Electronic Timer, White Programmable 24-hour timer; mounts flush to wall, replacing standard switch 7 on/off settings per day; for 2-way and 3-way switches; 4 programming options; 7-day timer Durable plastic housing Includes timer and 2 backup battery 4.31 by 1.73 by 1.29 inches; 6-year warranty