MecArmy says their FL10 is "probably the first carabiner coming with a flashlight." Probably. They're too busy churning out TC4 titanium torches styled after climbers' favorite clips to fact check, but...yeah, probably it is.
The FL10 carabiner's flashlight outputs up to 360 lumens, and contains a 100mAh USB-rechargeable lithium polymer battery. The bulb should have a lifespan of up to 50,000 hours. You can also use the MecArmy carabiner, or at least not worry about in dangling from your bag, in the rain, since it's IPX5-rated water resistant.
In addition to lighting the way as flashlight, the carabiner has a bottle opener feature at its closure, and comes with a paracord attachment. MecArmy finishes the FL10 with a permanent black or sandblasted coating they says is corrosion- and scratch-resistant. A titanium switch controlling the flashlight portion of the carabiner is designed to prevent accidental activation.