Red Puzzle - 4 lights

The red puzzle has 4 lights to activate and shows a screen with 4 vertical strips as show below. it may not look exactly like this for reasons that will become clear.

Solution: This task is related to the sound and volume control on the device. Changing the volume will cause three of the 4 bars to move up and down. To activate the lights you can first raise the volume to the maximum. Then lower it to the minimum. This will turn on 2 lights. The third is activated by setting the device to vibration only. On many phones this is simply a case of pressing down on the volume control once more after it is at minimum.

The final light is activated by plugging in a set of headphones into the device.