Press and hold the 'set' and '-' buttons together for 5 seconds to turn on/off. Choose from two modes with the 'set' button. Switch between them using '+' or '-' buttons. It's simplicity at your fingertips! Use '+' or '-' buttons to adjust the minutes, then hit 'Set'. Repeat the process to adjust hours. After setting the timer, simply open and close the lid. The device will then display a 5-second countdown before locking for the duration you've selected. It's as easy as 1-2-3!