Charge a USB connected device while keeping track of a vehicle's battery life with the built-in monitor. 

Features

• (3) LEDs blink every five seconds to indicate a short circuit, overheat, and start ready with over-voltage protection
• Integrated 2-pin SAE quick-connect charging port for an easy charger hook-up with rubber sealing cap
• USB output turns off after 3 hours once the engine stops running or if battery capacity is less than 50 percent.