Our door stop alarm dose not installation required, simply place the alarm behind any inner pull door (home, hotel, etc). very convenient to take with you when travel or stay indoor alone. A really must have around you.
Type:Door Stop Alarm
Material: Stainless steel cover/Plastic body/Damping rubber bottom.
Working voltage : 9(V)
Working current : 0.2(mA)
Battery: 1*9V battery(Not include)
Three sensitivity: High, Medium, Low