i have just got hold of some alarms made i think in the 80,s
anyway i cant get them to stay on they will only work if i tap them and the led comes on and when i run a piece of paper over rollers they work fine there is no on/off switch as i cam see and if i let the led go out after say 10 seconds i have to give them a tap again to get them to work theres 2 knobs that turn one is tone and other is volume can anyone help please i will try and send a picture so you can see
anyway i cant get them to stay on they will only work if i tap them and the led comes on and when i run a piece of paper over rollers they work fine there is no on/off switch as i cam see and if i let the led go out after say 10 seconds i have to give them a tap again to get them to work theres 2 knobs that turn one is tone and other is volume can anyone help please i will try and send a picture so you can see