This electronic programmable relay can be used to switch from high beam to low beam with just one single momentary push button or with a normal switch. It can handle a constant load of 60 Watt for either high- or low beam, so strong enough for a standard H4 headlight bulb. Can also be programmed as an on/off relay capable of handling a constant load of 120 Watt. Relay is 46 mm long and 16 mm in diameter.