The NeedleBay safely holds 2 needle tips for insulin pens. Once locked in the unit, they cannot fall out and hold the tip for easy attachment to the pen. Leave the needles locked in place once used, and receive quick visual confirmation if dosage has been administered. Safely dispose tips at the end of the day. Comes with 2 pods that hold 2 tips and 2 tablets each, for those using pills as well. Visit our website for an instructional video.