Product Description:
This timers allows you to set it and it will do the watering for you. 
 
Features:
> Working water pressure: 1 to 8 bar (15 to 116 psi) (solenoid valve inside)
> Manual Watering: Available (can be set from 1 min,.. up to 240 min)
> Programming: Easy to set with big dial
 Rain Delay button: You can set to delay watering by 24 H, 48H, or 72H
> Energy-saving solenoid valve technology used   
> Clock time display   
> How Often: can be set from 10 sec, 30 sec, 1min, 3 min, 5 min, 1h, 2h, 4h, 12h, 1 day,2 day... up to 7 day 
> How Long: 5 sec, 10 sec, 15, 20,25,..up to 55 sec, 1 min, ... up to 360 min
> Can be attached to  3/4''(19mm) or 1''(25mm) tap or faucet
 Solenoid valve used
> Please use  clean water ONLY
 2XAA Alkaline battery  (  not included )
 
Remark: (It has two modes :
1.when the frequency  is less than 1hour , after you set everything and it will work after a cycle frequancy no matter what the start time is.
for example , you can set the current time :12:00  start time: 12:02 , how often: 1min, how long: 10s , it will work 10s after 1 minute 
 
2 when the frequency  is  1hour or above, it will work according to the start time , please understand it 
for example , you can set the current time :12:00  start time: 12:02 , how often: 1h, how long: 10s , it will  begin working 10s on 12:02