Olight Warrior X Rechargeable LED Flashlight

The Olight Warrior X Rechargeable LED Flashlight warns you when the battery is getting low, even if you're not looking at it; the light vibrates, much like a phone with the ringer off, as battery power declines—every 5 minutes at 30%, every minute at 10%, and every 10 seconds once the power dips below 5%.