These Slim (But still bigger/better than originals) Joycons come with the latest Firmware installed & now have Zero Dead Zones!
Whilst still Bigger/Better than the standard joycons, they are smaller / slimmer than others on this page. (see pictures for comparison)
The LED ring function has 4 x Adjustable Brightness levels (& can also be turned OFF) with 8 different colours! (Incl rainbow LED) 3 different light modes: (Single Colour Mode, Breathing Colour changing Mode and Rainbow mode) all of which are independently set on Left and Right Joy-Cons.
Controllers will be charged whilst Docked (Yes, they still fit fine in the dock) or charge via a Supplied 1 x USB-C cable. (Check my store for Dual USB-C charge cables)
Built-in 500 mAh batteries on each side, allows you to play for approx. 6-8 hrs nonstop (They will re-charge from Switch if depleted) after fully charged and only take 2-3hs to be fully charged once on switch dock or via supplied USB-C Cable.
(FYI BinBok/NYXI/DOYOKY = Same. None are compatible with Amiibo