Tellegloww 20 Sets Nc Wired Surface Mounted Alarm Magnetic

Product Overview

The Tellegloww 20 Sets Nc Wired Surface Mounted Alarm Magnetic Door Contact Sensor is a practical and reliable security solution designed for home or office protection. These magnetic reed switch sensors detect when doors or windows are opened, triggering an alarm to alert you of potential intrusions. Ideal for renters, homeowners, or small businesses seeking affordable yet effective security, this set provides comprehensive coverage with easy installation and durable performance.

Each sensor features a compact design that mounts directly onto surfaces without requiring drilling or complex wiring. The included double-sided adhesive tape ensures a secure hold, making setup quick and damage-free. Whether used on entry points like front doors, back entrances, or interior windows, these contact sensors offer dependable monitoring to enhance your space’s safety.

With 20 units in one package, this kit supports multiple entry points simultaneously, giving you flexibility for larger properties or layered security setups. The wired connection allows integration with existing alarm systems, ensuring consistent communication between sensors and control panels. For anyone looking to improve their magnetic door alarm system affordably and efficiently, this product delivers essential functionality with minimal effort.

Key Features

• Surface-Mounted Design: Installs easily on flat surfaces using the included double-sided tape—no drilling or permanent modifications required. This makes it suitable for rental properties or temporary installations where preserving walls and finishes is important.
• Magnetic Reed Switch Technology: Utilizes a classic NO (normally open) to NC (normally closed) switching mechanism that activates when the magnet and sensor coil separate beyond a safe gap distance. This ensures accurate detection of door or window openings.
• Durable Plastic Construction: Made from sturdy plastic materials that resist wear, moisture, and daily use, contributing to long-term reliability and consistent performance in various indoor environments.
• Wired Connection: Features standard lead wires for direct connection to alarm control panels or monitoring devices, providing stable signal transmission without interference. Compatible with most wired security systems.
• Bulk Pack of 20 Sensors: Includes enough units to cover multiple entry points across homes, offices, or small retail spaces, offering cost-effective scalability for broader security coverage.

Technical Specifications

• Material: Plastic
• Type: Surface-mounted magnetic contact sensor
• Switch Type: Normally Closed (NC)
• Connection: Wired with lead terminals
• Mounting Method: Adhesive double-sided tape
• Quantity per Set: 20 sensors
• Installation Location: Doors and windows

Benefits & Use Cases

This magnetic door alarm sensor set is ideal for enhancing perimeter security in homes, apartments, offices, garages, or storage rooms where unauthorized access needs to be monitored. Its surface-mount capability allows installation on painted or finished surfaces without damaging them, which is especially useful in rented spaces. Each sensor pairs with a magnet placed on the moving part (door or window frame), and when separation occurs, the internal reed switch triggers the alarm circuit.

The inclusion of 20 sensors makes this kit suitable for medium-sized properties or multiple users sharing a single security setup. Users can distribute sensors across front and back doors, basement entrances, utility closets, or display windows to create a layered defense strategy. Since they operate via simple electrical contact changes, they integrate seamlessly with traditional hardwired alarm systems without requiring additional modules or power adapters.

The wired nature of these sensors ensures reliable signal delivery over longer distances compared to wireless alternatives, reducing the risk of dropped signals or battery failures. Combined with adhesive mounting, this makes them a dependable choice for continuous monitoring in environments where consistent connectivity is essential.

Important Notes

These sensors require pairing with a compatible alarm control panel or monitoring device that recognizes NC (normally closed) input channels. Before installation, ensure your existing security system supports wired contact inputs. The adhesive tape provides strong initial bonding but may lose effectiveness over time if exposed to extreme temperature fluctuations or humidity; periodic reapplication might be necessary in harsh conditions.

Do not submerge the sensors in water or expose them to direct sunlight for extended periods, as UV rays can degrade plastic components. While designed for indoor use, they can function outdoors if installed under protective covers. Always test each sensor after installation to confirm proper operation and alignment between the sensor and magnet.

Package includes: 20 magnetic contact sensors, pre-applied double-sided tape on each unit, and no additional tools or accessories are provided. Magnet placement should be within the specified operating distance (typically 1–3 cm) for optimal performance.