Victron Energy Smart BatteryProtect 12/24-Volt 220 amp with built-in Bluetooth, disconnects the battery from non-essential loads before it is completely discharged (which would damage the battery) or before it has insufficient power left to crank the engine When using Bluetooth to program Victron Energy Smart Battery Protect, any required engage/disengage levels can be set. Alternatively, one of nine predefined engage/disengage levels can be set. Bluetooth can be disabled Victron Energy Smart Battery Protect automatically detects system voltage. Can be set to engage / disengage at several different voltages. The seven segment display will indicate which setting has been chosen 12/24-Volt auto ranging: Victron Energy Smart BatteryProtect automatically detects system voltage one time only. Maximus continuous load current 220 amp and Peak current (during 30 seconds) 600 amp Incorrect installation can be hazardous, Please consult a licensed professional and follow all applicable electrical codes during installation