The Lind SDT1230U-023 Shutdown Timer protects your vehicle's battery from over discharge and equipment from low voltage and high voltage damage. This device turns off electrical loads at a preset time after the car engine is shut down. The unit protects your vehicle battery and communications equipment from over discharge, low voltage and high voltage damage.9-18 VDCWide delay time (5 seconds to 4 hours, factory set to 2 hours); Over-ride switch for emergency operationLow voltage shut down; high voltage shut downReverse polarity protectedLED indicators for on, off and timingRugged ABS case with screw hole mountsGeneral Information Manufacturer: Lind Electronic Design Manufacturer Part Number: SDT1230U-023 Brand Name: Lind Electronics Product Name: Shutdown Timer - SDT1230U-023 Product Type: Digital Timer Technical Information Features: Auto Shut-off, Reverse Polarity Protected, Rugged, LED Indicator Power Description Power Source: DC Physical Characteristics Product Material: ABS Weight (Approximate): 8 oz Miscellaneous Package Contents: Shutdown Timer - SDT1230U-023Output Cables AdapterInput Cables Adapter