Suitable for wooden door/glass door/plastic door. Specification: 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℃ 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.