The exposure flashflare light set the flash packs a punch to get you noticed day and night it39s also bright enough to see your way home when you get caught out and small enough to hide in your pocket it39s fully sealed and easy to use simply rotate the head to turn on and off the flash can use either disposable or rechargeable batteries the best performance will be from using exposure lights39 own batteries the flash will produce 40 lumens output with disposable cr123a bat