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A single button is used to switch between the white work light and strobing red safety light.
Built into the VCL10 is a photodiode light detector that can sense the change in ambient lighting and alter the flash of the red warning light from 1 Hz (1 flash per second) to 10 Hz (10 flashes per second) if an approaching vehicle is detected.
The head can be tilted by a 90° angle to allow you to aim the light where you want, and there's also a magnet to allow it to be attached to a car's bodywork.
The white light has an output power of 25 lumens, giving it a 7-meter beam, and has a runtime of about 3 hours, while the red strobe is rated at 350 mW (which is pretty bright), and has a 20-hour run-time.
And the great thing is that because the VCL10 lives in the car's 12V accessory port, it's always charged up ready for use.