1. High Temperature Warning Indicator in LCD display: When high temperature over 45 Celsius, the symbol of temperature light up and show red color, plus audible alarm then shutdown. 2. Show Battery Power in LCD display: Green means full power, yellow means half level, and red means low power of your battery, you have to recharge the battery at once. 3. High Voltage warning in LCD display: (1) When high voltage warning, the symbol of v lights up(Red), battery level bar flickers, input voltage display shows 15V or more, plus audible alarm then shutdown. (2) When low voltage warning, the symbol of v lights up(Red), battery level bar flickers, input voltage display shows 10.5V or less, plus audible alarm then shutdown. 4. Power on/off indicator in LCD display: The symbol show green means working normal, show red and faulty means without output. 5. Over load & Short circuit in LCD display: When overload, the symbol ( like a balance scale) light up(Red), load level bar flickers, no outputs