Wow...who'd thought there would be so many choices??? zoom/adjuster for sure. Have had BAD experiences with rechargeable.....don't know how many tools I had to get rid of over the years because batteries wouldn't charge and then to replace them, it was cheaper to just buy a whole new set. Been researching myself and amazed at the sizes available versus the amount of lumens some put out. Like my maglight 3D, only about 200 lumens, but an Archer 2V, close to 8-900 and with 2 AA batteries...I just can't get it out of my head that a flashlight has to weigh around 1-2 pounds. These new ones are measured in ounces.