Short press power ON, press + and - to adjust voltage,0.1V voltage adjust. Long press Power and "-" button together, If show B0 on the screen, that mean start-up function open.Long press Power and "-" button together, If show B1 on the screen, that mean start-up function off.? Big battery catacity 1100mAh, can use for about 5 hours. Specifications: Weight: 43g Diameter: 25mm Length: 77mm Battery Capacity: 1100mAh Working Voltage: 5-12V