High Decibel Alert: A sound alert is sufficient to deter potential intruders and protect your home or business. Whether you are inside or outside, the magnetic sensor switch detects unauthorized access to your home or office. Door Magnetic Induction: When the magnet is closed, the switch closes and the signal connects. When the door is opened, the signal disconnects and the circuit breaks. If someone forcibly opens the shutter door by 2-3 cm, the device immediately sends a signal to the alarm host. High Sensibility: The door and window alarm features high sensitivity. When someone illegally opens the roller door by 2-3 cm, the product instantly transmits a signal to the host, providing effective warning and theft prevention. High Quality: The outer shell is made of high-quality ABS plastic with a matte finish, offering a sleek and modern appearance. Security alarms help you detect unusual activity promptly. Easy to Install: Simple installation on roller doors, windows, or doors. Suitable for residential homes, offices, shops, and other commercial spaces. Features: The housing is constructed from high-quality ABS plastic with a matte finish. When the magnet is near the switch, the reed contacts close and the signal line connects. When the door opens, the magnet moves away, the reed contacts open, and the signal line breaks. Upon detecting an unauthorized opening of 23 cm on a roller door, the device immediately sends a signal to the host, triggering a loud alarm to deter intruders. Ideal for shops, stores, garages, supermarkets, and similar locations. Easy to install on rolling doors. Specifications: Housing Material: ABS Color: White Maximum Switching Voltage: 100V Maximum Switching Current: 0.5A Maximum Switching Power: 10W Output Mode: Normally Open, Normally Closed (optional) Size: 12 x 55mm / 0.5 x 2.2in Quantity: 2 pieces