https://www.vedardalarm.com/2-beams-solar-power-wireless-sensor-with-receiver-home-security-p-236

Photoelectric beam with receiver and converter
Outdoor anti theft intrusion alert system. Easy install on wall, fence, windows or balcony.
The package includes 1pair of 2-beams photoelectric infrared sensor (transmission and receiver consisits light wall to block intrusion) and 1 set wireless alarm receiver installed at home to receive alarm signal and get 4 types of remind tone. At same time, the receiver can be connected wtih any third party alarm panel and send alarm message via phone.
2-beam solar power wireless break alert
It is installed on wall or fence, driveway etc. outdoor yard.
Functions and Specification:
1.It is a solar-powered wireless product and should be installed at place with sunlight intensity more than 2200lux.
2.It is double beams wireless outdoor infrared detectors working by pairs of transmitter and receiver.
3.Irradiation distance:10m
4.Wireless transmitting distance:100m
5.Wireless frequency:433MHz
6.Maximum alarm times in 24 hours: