※ This is a single item listing, but there are 9 in stock. If you need multiple units, we will discount the shipping cost, so please let us know. This is the Alean ABT-100, a 2-beam infrared beam sensor from the overseas security equipment manufacturer Alean. It supports outdoor detection up to 100M. The 2-digit digital display allows you to adjust the sensitivity from 0 to 99, allowing for easy optical axis adjustment without the need for an electrical tester. I have been using it for about six months, and as long as the adjustment is done properly, there have been no false alarms, and the reliability is comparable to domestic products. Although the instructions are in English, if you have experience with beam sensors, the basics are the same as other companies' products, so you should be able to handle it easily. Support is available if you have any questions. Accessories include the instruction manual, pole brackets, and mounting screws. -Features- 1. Four selectable frequencies for long-distance and stacking installations 2. Double-precision digital display signal strength 3. Adjustable interruption time, allowing users to adjust according to the environment and scene 4. Intelligent heating function, effectively removing ice and frost, adapting to harsh environments 5. Gradual infrared signal processing function (comparable to AGC function) ensures that the item operates reliably in wind, frost, snow, fog, humidity, direct sunlight, and other bad weather. 6. Digital CPU control circuit to control the transmitter and receiver 7. Optional auxiliary device for adjusting the infrared beam, improving efficiency 8. Wide voltage design, power supply is between DC9-30V / AC9-20V, easy to supply power centrally. 9. Various application C relay output 10. Tamper switch, opens when the cover is removed 11. Waterproof rating: IP65 Manufacturer product information ↓ http://www.alean.com.cn/products_more.asp?id=2815&cl_na=Perimeter%20Infrared%20Beams&cl_id=586&sid=533 ※ If you purchase one unit, we will ship it as is with the shipping label attached to the box. ※ A dedicated heater unit is required for cold regions below -20 degrees Celsius. If needed, we will include it free of charge, so please let us know.