Flip up to fully power on. Flip down to put in standby mode. Comes with long cable. Screen is bright blue and gives battery voltage reading and degree of charge. Also gives percent load. For example, if you have a 4kw inverter and the screen reads 50% output, then you are using 2kw of the total 4kw. Also displays input voltage and output voltage if you are hooked up to shore power or a generator. The screen light will turn off after 15-20 seconds and you have to press a button to turn it back on. This is to conserve power.