One-way automatic timer. 63 preset programmes (+ off and 5-minute test) Easy programming by way of 2 knobs: one with 7 frequencies, the other with 9 watering times; simply turn the knobs for the required setting. The Claber Aquauno Select Water Timer easily combines the flexibility of various watering programmes with an inherently great simplicity of use. The timer on the Claber Aquauno Select features two dials only to make programming not just simple but highly user friendly as well. All you have to do, is to quite simply turn two knobs, one for the times and one for the specific frequency that you desire, so as to be better able to easily manage and maintain your core irrigation needs, while simultaneously creating your own highly customized irrigation program. Since it works on battery power alone, therefore there is no particular need for any wiring and electrical connection related complications. As a matter of fact, it is quite sufficient to simply screw it to the tap itself.