Incoming fitting (3/4" bsp tap thread ) top connection which screws straight onto your garden tap and the bottom outlet fitting is the standard hozelock 1/2" fast fit type. Clear screw on cover over controls to keep watertight. Right hand dial to to set watering Run Time 1,3,5,10,15,20,30,60,90,120 mins Left hand dial to set Watering Frequency Every 1,2,3,4,6,8,12,24,48,72,168 hours Instructions for use: Screw the timer onto your standard fitting garden tap. Connect your garden hose. Unscrew the clear waterproof cap. Set the two dials; the first for the time between watering, the second for how long watering lasts. Screw on the clear waterproof cap. Leave and forget. kingfisher or marksman. Approximate Dimensions: Height of timer (including fittings) 16.1cm (approx. 6'') Face diameter 8.1cm (approx 3'') Requires 2 x AAA 1.5v batteries (not included)