With Two Built-In Self-Priming Pumps, A Programmable Timer, And An, Watering. ? A/B pump switching: The blue indicator light is on which side, indicating which side of the pump, short press the A/B key to switch pump Settings. Hold down the A/B key to enter the manual mode, hold down the SET key to enter the timing parameter Settings, and short press the +/- key to adjust the value. ? Automatic timer function: switch which side of the pump you want to SET, LONG press the Set key to enter the parameter setting, "HOW LONG" can be set 1-59 seconds /1-15 minutes, "HOW OFTEN" can be set 1-23 hours /1-30 days, "DELAY" can be set 1-23 hours /1-30 days. ? Easy to assemble] This water timer set including: host *1 1/4-inch tube 393.7 inches *2 plugs *3 filter heads *2 fast tee *20 adjustable drop arrow *20 USB cable and plug *1; You can do your own watering plan, which will cut off the water pipes and design an exclusive irrigation system for your plants ? Scope of application?It can be used for many scenes, can be used in the garden, lawn, yard and other places,it can meet your daily life needs of the sprinkler timer. ? Warm Tip: The main machine body is not waterproof, built-in two pumps can be independently controlled, the number of grouped watering watering pot doubled. Adjustable drip arrow root watering, water flow can be adjusted. ? How to prevent the siphon effect: pump is not anti-siphon. The siphon effect can cause water to keep leaking from the dropper. Make sure the water level is lower than all potted plants, Or contour the first dropper above the water level.