Mengshen Door Knob Alarm 4 Pack, 120dB Loud Vibration Sensor Door Window Open Alert Siren DIY Protection for Home Security Apartment Travel Kids Elderly Small Size (Black)

• 🚪【Small & Portable】Small size, only 4.2 x 3.5 x 1.5 cm(1.65 x 1.38 x 0.59 inch) Great for home and travel.Comes with lanyard and silicone ring, you can easily hang, clip or bundle it on door or window.
• 🚪【Easy To Install & Use】Installation is nothing more than hanging the unit onto the doorknob and turn on the alarm. Once triggered, the alarm will ring continuously for 8S and the red light will be on.
• 🚪【Super Loud】Alarm will be triggered when vibration of door or window is detected, 120dB loud ring will alert you in time, an intruder will be startled and flee the premises.
• 🚪【Wide Use】This door handle alarm is great for home and travel, suitable for door handles, bedroom doors, houses and apartments, hotel rooms and dormitories.
• 🚪【Power Supply】Powered by 2 CR2032 button batteries (Included)

Easy To Install & Set Installation is nothing more than hanging the unit onto the doorknob and turn on the alarm. Reliable Security Once triggered, loud 120dD alarm sound will alert you, an intruder will be startled and flee the premises. Alarm Type: Vibration Burglar Alarm Alarm Mode: Sound & LED flash Alarm Volume: 120 dB Alarm Duration: 8s Color Options: Black/Red Power Supply: 2 x CR2032 batteries Suitable For: Door hand/Door knob/Window/Luggage Item Size: 4.2 x 3.5 x 1.5 cm(1.65 x 1.38 x 0.59 inch) Item Weight: 22 g(0.78 oz)