Feature: 1. Easy Installation: The door alarm sensor can be easily hanging on any door or window without the need for complicated wiring or installation. 2. Protection: The door alarm utilizes a magnetic button to detect and protect your home or office against intrusion. Regardless of whether you are inside or outside, you can believe our door alarm sensor. 3. Loud Alarm: The sensor is equipped with a 120dB alarm output that can effectively alert you in case of a break in, ensuring that you are always secure, no matter where you are. 4. Portable: The sensor is small, compact, and easy to install, which can be easily attached to any door or window and can be removed and taken with you on the go. 5. Versatility: The alarm is suitable for various settings, such as massage parlors, residential buildings, offices, and retail store counters. You can use it anywhere you need extra security. Specification: Item Type: Door Sensor Alarm Material: ABS Battery: 1 x 9V alkaline battery (excluded). Package List: 1 x Door Sensor Alarm