Electronic programmable timer runs on 1- 9v battery(not included), needs no wiring. Attaches to hose faucet. Easily programmable to run every 3, 6, or 12 hours, or water every day, 2nd, 3rd, 4th, 7th or 14th day. Watering time duration with 8 settings from 2 minutes to 9 hours. Ship wt 2#.