Use 1 x 9V battery (not including battery) when door pressure is applied, the extremely loud 120 dB alarm helps wake/alert homeowner or renter, helps deter intruder and possibly notifies neighbors NO installation required, Simply place the alarm behind any door. very convenient to take with you when travel or stay indoor alone. A really must have around you.Especially for girls. Can be used as a door stop alarm and door stopper, Its high damping rubber bearing can prevent the door sliding and prevent the bad guys into. A protector around you. Can be used in home and travel. Light indicator flashes if the battery is low. Without batteries it can also work as a wedge to prevent the door from opening or closing Notice: The door stop alarms fit for the gap between the door and the ground be 0.6'' and 1.2''. Portable and easy way to add piece of mind when traveling or working alone.
Package weight: 0.163 kg Product Dimension: 14.00 x 4.50 x 4.00 cm / 5.51 x 1.77 x 1.57 inches Package Dimension: 16.00 x 5.00 x 5.00 cm / 6.3 x 1.97 x 1.97 inches