Fist Alert Instan Alarm for Window and Doors As Seen On TV

1.Product description:

(1)Attach to the door or window side.

(2)Don't forget to switch to 'ON' when it work.

(3)when them separation of more than 10 mm,it will alarm.

(4)Build-in 90db high output alarm

(5)Be used to protect people against prizing and stealing

2.Specification:

Scare Off Intruders with Ear-Piercing Alarms Keep your home safe and secure with this super loud 90-decibel Alarm Set. The wireless unit installs in seconds on windows or doors and sounds the alarm when they're opened. Just peel and stick to any surface. Each alarm requires 3 button-cell batteries (included FREE!) Approx. 2-1/2"L x 1-3/4"W x 4/5"H. Set of 4