Feature:1. Versatile Usage: Door open sensor alarm is designed for home security, suitable for rental apartments, villas and so on.2. Low Battery Alert: Wireless window alarm with 105dB super loud alarm to scare away thieves and also has low battery alert with LED indicator.3. Doorbell Function: Wireless door alarm also has a doorbell function to remind people at home to open the door for you.4. Long Battery Life: The battery can last for more than 1 year, offering long lasting and reliable performance for home security.5. Easy to Install: Door window alarm can be easily mounted to a window or door with the included double sided tape, no tools required.Specification:Item Type: Wireless Remote Door AlarmMain Battery: AAA alkaline battery x 2 (batteries not included)Remote Control Battery: 27A 12V alkaline battery x 1 (included, capacity 30mAh)Remote Control Distance: approx. 30M/98.4ft without obstaclesBattery Life: more than 1 yearOperating Temperature: -10 to 60COperating Humidity: <80%Storage Temperature: -20C to 70C.Package List:1 x Alarm1 x Remote Control1 x Magstripe3 x Double Sided Tapes1 x English Instruction Manual