Blue Sea Systems M2 OLED Digital Meters Accurately measures and monitors State-of-Charge of 1 bank. Measures 3 voltages and 1 current. Includes One 500A Shunt Adjustable internal 92dB alarm for High Current, High/Low Voltage, Low Battery Auto-dimming, bright OLED display is daylight readable, and IP-66 Waterproof Input Voltage: 7-70V DC, Function Voltage: 8-70V DC, Supports Shunts up to 5000A DC