Seat elevator on power wheelchair. I got a chair with a seat elevator in my late teens and it was a total game changer for me. I was suddenly able to access so much more of the world and operate more independently, and eventually live alone on my own. I was barely able to get it and had to fight insurance as it was very costly at the time. Now in the USA, they just became standard through CMS (Medicare/Medicaid) which typically becomes standard industry wide, meaning seat elevators in power wheelchairs are now available to everyone with insurance. That's pretty amazing to me that this type of technology will be the default now.