This device monitors up to 3 independent DC sources simultaneously. Add smart notifications to send email and SMS alerts when voltage drops below your thresholds. MySpool voltage monitor is powered by 3 AA batteries which are not included.  It comes with a 5 ft car cigarette lighter cable. It also comes with a battery clip-on car cigarette lighter adapter. 

This device can be used as is with cars that provide continuous power to the cigarette lighter adapter. A battery clip-on car cigarette lighter adapter is included for direct connection to the battery if desired. For more information and to purchase one and take advantage of free shipping in the United States click here.