Warns you if the door is opened without permission when you are not at home. Easy to use anywhere.Informs you in case of unauthorized intrusion Alarm volume: 120 dB Simple security system for bedrooms, hotels or apartments Trigger has three sensitivity levels: High, Medium and Low Can be used as a doorstop when turned off Battery: 9V (not included) Very durable ABS plastic and stainless steel cover Weight: 150g General product data: Weight: 0.086 kg Height: 4 cm Width: 4.6 cm Length: 13.8 cm