Features: 
This is a pair of infrared detectors including the transmitter and receiver to enable automatic sensing of ambient changes and when the beam being bothered, it alarms you.
It is an intelligent item and its alarm distance up to 100m in outdoor environment.
There are dual beams for quick speed respond. With premium shell, it is waterproof for practical use.
The transmit power will be adjusted automatically according to the environmental conditions, which greatly extends the life of the launching tube, while lowering power consumption.
Optical lens up and down while structural adjustments, to adjust faster and more accurately.
Professional chips and strong anti-interference provide smart detection alarm technology to modern life.

Specifications: 
Material: Plastic
Color: Black
Light Source: Infrared LED
Alarm Distance: 100m (Outdoor)
Response Speed: 50 - 700 ms
Alarm Output
1. Relay Contact Output: NO or NC
2. Contact Capacity: AC/DC 30V/0.5mA
Working Voltage: DC 12-24V, AC 11-18V
Working Current: ＜100ma
Horizontal Light Adjusting Angle: 180°±90°
Vertical Light Adjusting Angle: 20°±10°
Waterproof Rate: IP55
Package Weight: Approx. 690g

Package included:
1 x Set of Sensor Alarm with Accessories

Note:
It is easy to install but professional installation is highly recommended.