All Stella's are equipped with Travel Lockout mode. These will have a Lock icon on the slider switch. While the light is off, hold the switch forward for 5-8 seconds until the dashboard LEDs begin flashing red. Trying to turn the light on after this will result in the lights flashing red but the light not turning on. Repeat this procedure until the lights begin flashing green to unlock the light.
All Stella's have a rotating slider switch that prevents the slider from moving. Simply turn the switch dial 90 degrees so that the ridge on the switch points towards the front and rear of the light.