You'll also notice that not all "PD" are the same. The latest "PD" technology offered is "PD 3" (all of my linked products above are "PD 3.") So, what's the difference? In a nutshell:
"The difference between the two types of PD charging lies in the amount of detailed information given by each. USB PD 3.0 has worked to improve its power delivery but is primarily known for offering increased amounts of information about the device being charged and its power/ battery. This includes reporting any malfunction or system change within the device, temperature of the device, or what may be causing hold ups or decreased charging speed, etc. For example, if an over-current or over-voltage occurs while charging, your device will notify you with a data message of the mishap."
For more detail info on this:
https://satechi.net …-usb-pd-2-0-vs-usb-pd-3-0
You'll also notice the term "GaN" technology in my linked products. In a nutshell:
"GaN chargers are physically smaller than current chargers. This is because gallium nitride chargers don’t require as many components as silicon chargers. The material is able to conduct far higher voltages over time than silicon.
GaN chargers are not only more efficient at transferring current, but this also means less energy is lost to heat. So, more energy goes to whatever you’re trying to charge. When components are more efficient at passing energy to your devices, you generally require less of them."
More detail:
https://www.howtogeek.com …nd-why-will-you-want-one/
Both these latest technology offer a big advantage for us photographers using these devices to power our cameras, and why I now (almost) exclusively use them.