Door Alarm Sensor Set of 3, 125dB, Window/Door Open Alarm Sensor for Home Security, White Brand new, unopened. As this is a foreign specification, the instructions on the back are not in Japanese, so you will need to use a translation app or Google Lens. Not suitable for sliding doors that open sideways. Suitable for opening doors and windows as shown in the photos. I accidentally purchased this, so I am selling it at a low price. Thank you for your understanding. 125dB alarm for doors/windows that warns intruders. - Sound intensity: 125dB - Installation: Easy installation with adhesive tape - Function: Door/window entry alarm #DoorAlarm #Security