The Hozelock AC 1 is a battery powered water computer that attaches to an outside tap. It is supplied with three tap adaptors to enable connection to any outside tap (1", 3/4", 1/2" BSP). The AC 1 is programmed using a dial , this allows the user to select one of 13 pre set programmes. Allows watering cycles from 4 times per day to once per week. The AC range uses 2 x C Type batteries and these typically last for 12 months. The water flow is controlled using a ball valve.