M2 DC Voltmeter. Monitors DC Voltage on large, bright display. Accurately measures and monitors the voltage of up to three batteries.. Features:. Auto-dimming, bright OLED display is easy to read. Easy to adjust. 92dB alarm on all models. Isolated MOSFET relay. Specifications:. Meter: Voltage. Function: 8 to 70V. Resolution: 0.01V DC. Alarms: High/Low Voltage. Display Size: 55mm x 28mm. Input Voltage: 7-70V DC. Maximum Power Consumption: 1.00Watt. Minimum Power Consumption: 0.3 Watt. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.