The Helios 1 runs four (4) 120 Volt ballasts for a maximum 4000 watts of HID lighting over your plants. It has a built in 24 hour timer with 96 - fifteen(15) minute non-detachable setting tabs for a variety of timing solutions for your garden. Three (3) screws under the back panel cover make this timer easy to wire into your power system. The lighting controller has a convenient 'On/Off' switch that makes lamp cleaning and replacement easy. The Helios 1 has the quality, features and functionality you've been looking for in a HID lighting timer!