To date, there are five versions of the Activator adjustment tool. The original Activator 1 is a hand-held device that allows practitioners to deliver high-speed and low force in an anvil-style motion to precise degrees. The Activator II Chiropractic Adjusting Instrument with Palm and Finger Pads offers the same benefits plus the adjustability to accommodate pediatric, geriatric, and small-framed patients. Next, the Activator IV separates itself from the earlier versions with an expanded range of force settings (1-4) designated for four areas of the spine. On the other hand, the Activator V comes with the benefits of the prior models, except this gun-shaped version produces the electronic thrust with the push of a trigger-like button. This feature reduces the stress on the doctors' hands.