Window and door sensor alarm that alerts intrusions with a 105dB sound. - Model Name: Window Guardman - Package Contents: 2-pack - Sensor Type: Door/Window Sensor - Volume: 105dB - Installation: Easy installation - Sensor Range: 8mm Thank you for viewing. This item has been at home without being used for a long time! The outer case has discolored due to deterioration, but I believe the sensor inside is in good condition, so please consider purchasing if you understand this.