Quick Alarm & 3 Modes: The "Alarm" mode will immediately activate a continuous and super strong siren when the sensor and the alarm are separated by more than 2 cm until they are back together. In "Chime" mode, the door alarm will emit a brief audible alarm, serving as a gentle reminder. If you prefer silence, simply switch to the "Off" mode. 3-level volume control: The door alarms for your home can also be used as window alarms for security, pool alarms, shed alarms, garage alarms, or sliding door alarms. TECKNET door sensors with 3-level volume control are the perfect solution for apartments, mobile homes, offices, hotels, stores, and more. Easy to Install: Just use the attached stickers to gently install the burglar alarm on various parts of the house, such as doors, windows, cabinets, drawers, gates, etc.! (Note: Keep the installation area clean and ensure that the sensor is installed within 2 cm from the arrow side of the alarm.) Mini and Portable: With its mini design, this wireless ring alarm won't take up any extra space. You can easily carry it in any backpack when you go out. (If the alarm isn't working, check if it's in OFF mode or if the batteries need replacing.) 36 Months Warranty: If you encounter any problems in using the product, please feel free to contact our professional customer service team, enjoying TECKNET 36 Months Warranty (Registered Only), Manufacturer: TECKNET