Streamlight 3 AA Twin Task LED/Xenon Flashlight-Black Computer Machined Aluminum 0-Ring Sealed 3 AA Twin Task LED/Xenon Flashlight - Black. All alkaline powered lights require batteries. All LEDs are white in color. This amazing new Twin Task light offers a patented LED/xenon combination, so you can choose between a super bright light (xenon) and an incredibly long runtime (LED). The Twin-Task is ideal to use in a wide variety of applications, including industrial, automotive, security, household, even recreation.