Stalwart Door and Window Alarm - Wireless Magnetic Anti-Theft and Burglary Sensors for Home and Business Protection and Security (Set of 8) WHOLE HOME PROTECTION- These window and door alarms come in a set of 8 so you can have whole home protection. They stick on to window frames and door jambs with the included double-sided tape for quick installation. 105 DECIBEL ALARM- The magnetic sensor in each alarm triggers when a door or window opens. The unit emits a 105-decibel beep to scare away intruders and alert you to trouble. The alarm can be reset with the on/off switch. WIRELESS SENSORS- Each alarm unit runs on 3 LR44 button batteries and they are not WiFi capable. This means they will continue to protect your family even if your house loses electricity or internet access, giving you peace of mind in any situation. ATTACH ANYWHERE- Not only are these sensors great for protecting your home, they can also be used to keep you safe in hotel rooms or in your RV. They can also be used to deter thieves from breaking into store displays or cash registers. PRODUCT DETAILS- Alarm Dimensions: 1.75 L x 2.5 W x 1 H. 105 Decibels. Each Alarm Requires 3 LR44 Button Batteries (Not Included). Includes Double Sided Adhesive Tape. Set of 8.