The 2 Tactical Flashlights are bright and will come in handy. I will keep 1 flashlight in my house and the other flashlight in my car. The 2 flashlights came in a nice case for storage.You can use a Lithium-ion battery or 3 AAA batterires. I used AAA batteries and the flashlights work fine and have 5 light modes.. There are 3 brightness levels a strobe light and an SOS light. These flashlights are water resistant. If you want to use a Lithium-ion battery there are plastic cases for the batteries.The flashlights are lightweight and sturdy. 1 flashlight is 5.3" and the other flashlight is 6.2". It was easy to put the AAA batteries into the holder and then into the flashlight.The light on the flashlight is also adjustable. I recommend these Tactical LED Flashlights. https://www.amazon.com/gp/product/B06WW31Q7J/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1 #RankBoosterReview ii, Sponsored iii #2TacticalFlashlights