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The infrared sensing terminals of the solar sensors can be mounted up to 190feet apart,and will send a wireless signal back to the wireless alarm receiver up to 1/4 mile away anytime the intruder passes between the sensors;the solar sensor is powered by built-in lithium ion batteries those are recharged through the solar panels during the day, requires no wiring and easy to install.the wireless alarm receiver has 4 wireless zones and each zone has its own ring tones(such as chime/doorbell/etc);it is the ideal for all types of outdoor intrusion alarm application,such as driveway/fence tops/windows/etc. FEATURES: --Fully expandable system; up to 32 sensors can be connected to one wireless alarm receiver, while 1 sensor can be connected to unlimited wireless alarm receivers. --The solar sensor is equipped with self-calibration tools (calibration hole), capable of finishing long range calibration in minutes. --Powered by built-in lithium ion batteries those recharged through the solar panels during the day,cloudy and rainy days can charge the batteries normally( (note: when there is no natural light, the built in batteries can support 3-5 days of system operation, but the system is not suitable for long time indoor application). --Waterproof IP66 Fully-enclosed design,resistance to rain/fog/snow/etc(working temperature range from -40℃ to 70℃).