Specification: Item Type: Door Magnetic Contacts Switch Sensor Weight: 168g/5.9oz Sensing Distance :50-70mm/2-2.8in Material: Aluminum alloy silver gray plating Suitable for Working Voltage: 12V Applicable to Working Current: ≤500ma Contact Mode: (NC\NO) Normally closed Installation Mode: buried, surface installation Scope: Applicable to all kinds of rolling shutter doors Package List: 1 x Magnetic Contact Switches  4 x Screws  1 x Accessory Features Superior Magnetic Strength: Our Door Magnetic Contacts Switch Sensor Features a powerful magnet that ensures a strong connection between the door and the switch. This strong magnetic force guarantees that the sensor will only activate when the door is opened or closed, minimizing false alarms and providing accurate detection. Universal Compatibility: Our Door Magnetic Contacts Switch Sensor is compatible with most doors, making it a versatile and practical security solution for homes, offices, shops, and more. Whether you have wooden, metal, or glass doors, our sensor can be easily installed to provide reliable and consistent protection. Easy Installation: Say goodbye to complicated and time-consuming installation processes. Our Door Magnetic Contacts Switch Sensor is designed for hassle-free setup, allowing you to secure your doors effortlessly. The compact and discrete design ensures that the sensor blends seamlessly with your door frame, maintaining the aesthetics of your space. Anti-Theft Security: Protect your valuable possessions and loved ones with our Door Magnetic Contacts Switch Sensor. The sensor acts as a deterrent to potential intruders, sending a clear message that your property is monitored and secured. Reliable and Long-Lasting: Rest assured that our Door Magnetic Contacts Switch Sensor is built to last. The high-quality materials used in its construction ensure durability and longevity, even with repeated use. This reliable sensor will continue to safeguard your doors for years to come, giving you the confidence and reliability you need in a security device.