Short press the front cover to turn on, switch color & light modes. Long press(press and hold) to turn off, they will always memory the latest setting on lighting color & mode and brightness level before you change the AA batteries.
When you use several lights together, use the remote to select your preferred light color & brightness level among 30%, 70%, 100%, or one-time set the lights to turn off automatically 30, 60, 180 or 360 minutes later. The default timer is 120 minutes in case you forget to turn off the lights as to extend battery life.