I just bought a car with a Gemini aftermarket alarm fitted. The person I bought the car off bought it 4 months ago from a used car dealer who had turned off the alarm from the engine and they never got it turned on.

I now want to turn it on but don’t know how. I had a look under the bonnet and found an 'On - Off' sign above a circle on the top of the alarm. It has a smaller rectangle inside the circle that has half-circles at each end but it doesn’t appear to turn or accept a key.

If anyone has any knolledege of alarms please give me soe advice.

Cheers