When you desire versatility, bring in the heavyhitting EI600 Series Heavy-Duty Astro Timer. The EI600 features up to 40 ON/OFF programmed events per week and an automatic daylight saving time adjustment. It controls AC and DC up to 277V and has an astronomic feature which can be combined with specific ON/OFF programming. Convenient program capabilities are designed to suit any lighting schedule. All programs are securely stored in non-volatile memory and backed up by a CR2 lithium battery. The timer is compatible with single-pole and 3-way incandescent, fluorescent, CFL, and LED bulbs and requires no neutral wire. With robust performance and an abundance of features, the EI600 is the number one choice for in-wall timers.