It is upgrade version of 1byone driveway alarm type QH-0338. Two sensors work with one receiver. Perfect if you have two places need to be monitered. No matter which sensor is triggered, the receiver will get a alert signal and alarm. Easy Installation with Upgrade Auto-learning Code, it is much easier for you to install and match with more receivers or transmitters.
It detects people and cars up to 20 meters away and then transmits a wireless signal back to the receiver up to 100 meters away. The fully Weatherproof PIR has a 20 meter long single sided infrared beam which is very simple to install and due to the narrow designed beam will avoid picking up small animals passing by on the ground.
Ring volume up to 90db within 0.6M,There is a sliding switch on the side to allow you to select the alarm volume – high, low and off. It contains a series of LEDs and a small buzzer to let you know when the outdoor unit detects motion. Perfect for protecting a single farm entrance or a gateway.

All the functions of a high-end alarm monitoring system without the monthly fees!
Totally wireless system with built-in GSM dialer. Activates siren then dials your phone or sends a text message in case of intrusion
Remote monitoring. Call the system anytime and check status, remotely arm or disarm the alarm and use the intercom function