Nitecore EC11 900 Lumens Brightest Mini Cree XM-L2 U2 LED Flashlight with a Lumen Tactical Keychain Light Maximum 900 Lumens output when use 1x IMR18350 rechargeable battery Convenient dual side mode and power switch to enable easy access to five brightness, strobe SOS Subcompact size that fits in palm, pocket or purse; less than 3 inch length and 1.6 oz only Support battery type: 1x (R)CR123A or 1x IMR18350 lithium ion rechargeable battery Also include a bonus lumen tactical keychain light Turbo: 900 lumens - 30 minutes High: 300 lumens - 45 minutes Medium: 160 lumens - 90 minutes Low: 70 lumens - 2 hours 30 minutes Ultra low: 1 lumen - 12 hours