HTZSAFE Solar Wireless Outdoor Photoelectric 3 Beam Sensor Waterproof(IP66) Wireless Transmission Range Up To 1/2 Mile Infrared Detection Range Up To 300 Feet Extra solar sensor compatible with original driveway alarm by HTZSAFE. NO WIRING NO NEED TO REPLACE BATTERIES- Self-powered by solar recharged rechargeable batteries;no need sunshine,the nature light on cloudy and rainy days also can charge the batteries normally; requires no wiring(both the power cables and signal cables) WIDE RANGE OF APPLICATION(Driveway,Perimeter Defense and etc)- The infrared detection range of the solar sensors up to 300 feet,that means the infrared sensing terminals can be mounted up to 300 feet apart;and will send a wireless alarm signal back to the solar receiver up to 1/2 mile away anytime someone passes between the solar sensors(Actual range will vary depending on the local terrain);the detecting sensitivity is adjustable,you can do it yourself according to the actual application LOWER FALSE ALARM RATE- The use of active and multiple infrared beams reduce false alarms from small animals and small objects such as birds and falling leaves;super infrared penetrating power reduce false alarms from the bad weather such as rain/fog/snow;infrared analysis technology reduce false alarms from the other nature light sources interference such as sunshine EASY TO SET UP- The solar sensor is equipped with self-calibration tools (calibration hole and digital calibration screen), capable of finishing long range calibration in minutes