... It needs to recharge for 20 hours. 2. How to operate 2.1 Press the top button to work, with indicator light on. The oscillation will ... you to change the position and angle. 2.3 Press the bottom switch to shut off, with indicator light off. To repeat the action, just press the ... after 30, 60, 90 seconds working for reminding you to change the position and angle. 5. Within working hours, Presses down ...