4.Arrow Button Lock Functionality: Keep pressing the up-arrow button and down arrow button simultaneously for 2 seconds when the battery is on, they will be locked to avoid unintentional presses. You can do the same operation to unlock them. 5.Continuation of iStick Advantages: OLED display, adjustable voltage/wattage, large battery capacity. These advantages that make you love iStick will all be found in iStick 30W.