Operates magnetic or electronic ballast up to 1000 watts. IEC 320 power input cord set attaches to any ballast. Heavy duty relay will run your ballast trouble free for years! 24 hour timer can be set for any lighting requirement your plants require. Plastic cover on timer protects from dust and moisture. Compatible with digital ballasts. 10 Amps maximum/120 Volts/60 Hz./1000 Watts.