Now, the SureFire 2211 Luminox watch comes with a powerful built-in light fixture that can light up a room.
Created by SureFire and Luminox, the watch is designed for military, law enforcement and first responders.
Its chunky look, simple features and high price tag of $795 (about 4,900 yuan) probably won't interest many ordinary consumers.
Police use cases in action
The SureFire2211Luminox watch comes with a rechargeable battery and an LED bulb with 300 lumens of light at full power, but only lasts about an hour.
Use the brightness of 60 lumen or 15 lumens, lighting time can last 13 hours.
The watch's face is made of lightweight space aluminum.
A separate battery is also built in, allowing the watch to keep going even when it's out of power, with a light backlight allowing the wearer to check the time in the dark.
There is also a USB port on the side of the watch for users to recharge at any time.