Usage Tips:Magnetic Door Window Contact Sensor Alarm Reed Switch Security Burglar Alarm Features: The shell is made of ABS material, which is wear-resistant and durable, and is not easy to damage. Sealed design, dustproof and waterproof, even if the door sensor is in the water, the signal will not be interrupted. Strong adsorption force, the magnet end is made of strong magnetic potting to make the sensor more sensitive Light weight, easy to install, strong concealment. Suitable for wooden door/glass door/plastic door. Package Includes: 1 Set Window Sensor Specifications: Material: Plastic Length: Approx. 64mm/2.51inch Style: Normally Closed / Normally Open Detection Angle: 360 Detection Distance: 20-30m/65.62-98.43ft Transmitting Frequency: 315/433mhz Working Voltage: 100v Quiescent Current: 0.5ua Alarm Current: 15ma Working Temperature: -10~60 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.