... : On press, increases voltage by .1 increments between 3volt and 6 volt. 3. "-" Button: On press, decreases voltage by .1 increments between ... 3volt and 6 volt. 4. "+ "and "–" Button: Press and hold both buttons for five ... the battery drains, the device will keep the voltage consistent.6. 10 Second Cutoff timer: If the activation button is held ...