APPLICATION --- The battery testers can be used for testing battery voltage and capacity for electric motorcycle, motorcycle，golf cart, automotive , car, marine, RV, boat, etc. APPLICABLE BATTERY --- The digital battery monitor is suitable for 7-100V (12v 24v 36v 48v 60v 72v 84v) Ternary lithium battery, lead-acid,AGM battery, LiFePO4 battery. Default 12 volt lead acid battery . PROTECTION ---The smart battery monitor with fully colsed protective shell, dustproof ,IPX7 Waterproof ,It can be used for indoor and outdoor. input reverse connection protection. INSTALLATION --- The red wire for the positive and the black wire for the negative. The wires length are 23.62 inches(60.0cm),we provide mounting bracket,double-side adhensinve and screw for conventient installing. Buzzer Alarm&Temperature--- The battery monitor can set low and high voltage buzzer alarm and short press"M"key can switch voltage and temperature（Celsius).