The mechanical operation of this Orbit brand faucet timer requires no batteries, making it one of the easiest and quickest timers to use. It works just like an egg timer, simply twist the large dial to the desired watering duration and the water will automatically turn off when through. For added convenience, it is equipped with both timed and manual watering options. Timed watering can be set from 15 to 120 minutes. The mechanical timer features a full flow design to make the most of water pressure.