Features: The shell is made of ABS material, which is wear-resistant and durable, and not easy to damage 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 made of strong magnetic potting to make the sensor more sensitive Lightweight, easy to install, with strong concealment Suitable for wooden doors, glass doors, and plastic doors Package Includes: 1 Set Window Sensor Specifications: Material: Plastic Length: Approx. 64mm / 2.51inch Style: Normally Closed / Normally Open Detection Angle: 360 degrees Detection Distance: 20-30m / 65.62-98.43ft Transmitting Frequency: 315 / 433MHz Working Voltage: 100V Quiescent Current: 0.5μA Alarm Current: 15mA Working Temperature: -10°C to 60°C Note: 1. Please allow 1-2cm errors due to manual measurement; ensure you are comfortable with this before ordering 2. Due to differences between monitor displays, the picture may not reflect the actual color of the item