An Amped Outdoors Bluetooth Smart Battery Monitor allows you to check the working order of your battery via your smartphone. Connect the high-precision meter with the Amped Outdoors Smart Battery Monitor app to learn discharge or recharge currents and precise voltage and amperage measurements. The Amped Outdoors Smart Battery Monitor measures all in real-time and displays in real-time! You can use the Bluetooth Smart Battery Monitor with all batteries ranging from 8-80 volts and up to 500 amps.* There's no need to guess the status of your power source if you have this Amped Outdoors Smart Battery Monitor!Check the status of your battery via your smartphone in real-time measurementsBattery Monitor is compatible with all types of batteries ranging from 8-80 volts with up to a 500amp current*Monitor measures the discharge or recharge currents and calculates the amp hours going in and out of the batteryQuantity per pack: 1*Compatible with 50Ah batteries and larger. Older versions of 24v 80AH and 36V 60AH batteries with recessed terminals will need a jumper cable which is not provided.