PDA4 Electronic Door AlarmPDA4 Electronic Door Alarm For vaccine fridges without internal door alarms Pharma 1000 and 3000 models already have door alarms built in The alarm is activated if the door is left open for a set amount of time. Your preferred open time is easy to set and can be adjusted to within 0 _ 21 minutes Help to avoid cold chain breaches, protect sensitive and expensive medications, avoid security call out costs Simple to fit No tools required. Alarm attaches