Description <br> Description: <br> 108db Loud Alarm: This door sensor alarming is loud enough to detect entry. Suitable for window, door, freezer, file cabinet, etc. <br> 4 Modes: Designed with normal alarm, continuous alarm for 30s, door closing reminder, and doorbell mode to meet various needs. <br> Easy Installation: Install the alarm and sensor to door or window with double sided tape, the distance between the sensor and alarm should be less than 1cm, designed for indoor use only. <br> Power Supply: Powered by 2 pieces of AAA alkaline batteries(not included). remind with LED indicator. <br> Wide Application: Perfect for home, office, cabinet, dorm room, apartment, or shop. <br> Specification: <br> Material: ABS <br> Working Voltage: 3V <br> Alarm Current: 3mA <br> Detection Angle: Horizontal <br> Quiescent Current: 0.1uA <br> Working Temperature: 0 Centigrade Degrees to 60 Centigrade Degrees <br> Detection Distance: 20cm to 30cm <br> Volume: ≥108db <br> Upgraded Door Closing Reminder Function: <br> The delay time is upgraded to 3/15/30/60s, the default delay time is 15s. <br> Upgraded slower DIDI DIDI prompt sound, not noisy and harsh. <br> There will be a beep prompt after canceling then silent, and prompt after delay. <br> Size Chart: <br> 8.5cmx4.3cmx1cm/3.35inchx1.69inchx0.39inch <br> Package Includes: <br> 1 Piece Manual <br> 1 Piece Door Sensor Alarm <br> Note: <br> 1. Please allow slight errors due to manual measurement. <br> 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. <br> 3. Wish you wonderful online shopping! <br>