Features: The shell is made of high-strength zinc alloy material, which is wear-resistant and durable, and is not easy to be damaged. Sealed design, dustproof and waterproof, even if the door sensor is in water, the signal will not be interrupted. Strong adsorption force, the magnet end is potted with strong magnetic, making the sensor more sensitive Light weight, easy installation and strong concealments. Suitable for wooden door/glass door/plastic door. Package Includes: 1 Set Sensor Specifications: Material: Zinc Alloy Size: As Pictured Induction Distance: 50-70mm/1.97-2.75inch Current: 0.5A Voltage: 100v Power: 10w Signal Output: Normally Closed/Normally Open Conversion Type Nc/com Connection Method: Wire 550mm/21.65inch note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.