The Intermatic Heavy Duty Timers are great for lighting, air conditioning or other high amperage devices. They have 4 trippers that you can place for up to 2 on/off times per day and a manual override to allow you to turn them on or off without changing the current timing. They have a 30 minute resolution. It has an industry standard NEMA 5-20 plug configuration. It has an industry standard NEMA 6-15 plug configuration. The 240 volt timer is rated at 15 amps and will control up to three 1000 watt lights.