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 means start-up function open. Long press Power and "-" button together, If show B1 on the screen, that means start-up function off. Big battery catacity 1350mAh, can use for about 3-5 hours. Specifications: Weight: 53g Diameter: 32mm Length: 50mm Battery Capacity: 1350mAh Working Voltage: 5-12V