How to use the flashlight on an Apple Watch

You can use the flashlight on your Apple Watch to light a darkened door lock, alert others when you’re out for an evening run, or light nearby objects while preserving your night vision.

• Turn on the flashlight: Press the side button to open Control Center, then tap the flashlight icon. Swipe left to choose a mode—steady white light, flashing white light, or steady red light.
• Adjust the brightness: Turn the Digital Crown up or down.
• Turn off the flashlight: Press the Digital Crown or side button, or swipe down from the top of the watch face.

(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)