With this custom door alarm the way it's designed to work is if a door is propped open or if someone jams the lock open the timer starts.
The timer can be set from 30 seconds to 30 minutes depending on each requirement. After the timer has ran out of time, the circuit engages a small buzzer and small LED light. You can also install a strobe light indicating door is ajar perfect security feature for condominium back doors in Warehouse doors commonly propped open.
