Features: brand new and high quality The for shell is made of ABS material, wear-resistant and durable, not easy to damage. Sealed design, dustproof and waterproof, low false alarm. Strong adsorption force, strong magnetic potting is used on the magnet end to make the sensor more sensitive Light weight, easy installation, strong concealment. Suitable for wooden/aluminum doors and for windows. Specifications: Material: ABS Size: As Shown Sensing Distance: Approx. 15-25mm/0.59-0.98inch Hole Distance: Approx. 10mm/0.39inch Switch Form: Normally Closed Maximum Power: 10W Maximum Voltage: 100V Maximum Current: 0.5A Load Current: 300mA Life: 1 Million Times Package Includes: 1 Set Window Sensor note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.