A rechargeable battery via a 12-volt DC, 10-watt solar panel powers the Tank Alert Solar alarm from SJE-Rhombus. In full alarm, the unit will run for about 24 hours. Idle use without solar charging will run for about five days. It features a NEMA 4X indoor/outdoor-rated enclosure with integral mounting tabs for convenient installation and features LED indicators to show power on, reverse battery polarity and battery charging. Lithium-ion batteries provide backup power. 888/342-5753; www.sjerhombus.com.

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