Features: Firstly,turn the knob to the corresponding position according to the battery quantity You will charge, then plugging in the batteries in sequences "1-2-3S...", finally connect the series board to the charger with cables.Example: You have 3 batteries to charge, firstly turn the knob to "3S" position, then plugging the battery into port 3S in sequences, and finally connect it to the charger with the balance cable and XT60 cable. All batteries should be the same, battery capacity, battery type, brand. Never leave board unattended while charging or discharging. Do not charge over 1.5amps. The fuses is 5A that not means you can charge it in 5A, the knob is for 1.5A so not charge it over 1.5A. Not plugging in both PH2.0 and BT2.0/GNB27 battery in the same port. Specifications: Component:Circuit Board Type:BT2.0+PH2.0/GNB27+PH2.0 Size:Approx.9x5cm/3.54x1.96inch Package Includes: 1 Set Charging Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.