LOUD ALARM: The 120 DB security alarm is perfect for signaling to you when there is an unwanted entry. Audible at over 750 feet it sounds loud so the person knows they should stop what they are doing. Great for prevention, protect your children’s rooms or stop anyone from sneaking out or in. WIRELESS ALARM SENSOR: No wiring is necessary and 3 LR44 batteries are included in each device. Made to last 6 - 12 months these batteries in the alarms will be charged for extended periods of time. When it’s time to change, you’ll know. With the intuitive low battery indicator you can easily find out when you’ll have to change the batteries. EASY TO INSTALL: The wireless security alarms can be installed anywhere with an opening. Simply use the adhesive provided and tape it to wherever you need! Windows, doors, and entrances simple and straightforward with the alarm. The minimum distance for the device to work is 8mm (0.3 inches), so when installing make sure to get both pieces of the alarm as close as possible. SLEEK DESIGN FOR HOUSE- With an ultra slim build and sleek design these alarms can be put easily wherever you need them. Great for attaching to house doors, all types of apartments, and cabinet or office, put them where you see fit. They may be discreet and simple to install but don’t be deceived these alarms pack a punch, ready to deter any unwanted actions. PACKAGE INCLUDED: 3 * Alarms with tapes (Batteries included), 2 * Anti-noise Ear plugs, 1 * User manual. UPC 619317730816 061931773081 Brand Flyoukki Color White Manufacturer Flyoukki Model Number MSA-820 Power Source Battery Powered Audible Noise 120 Decibels Maximum Range 750 Feet Mounting Type Door Mount Control Method App, Touch Mfr Part Number MSA-820 Sensor Technology Contact Sensor Compatible Devices Home Security System Battery Description Alkaline Item Dimensions L x W x H 1.5 L x 0.37 W x 2.9 H