TL;DR...What this is: A great option to charge 2 batteries at one time before tossing it your bag as extra batteries for long days of shooting... with a screen to show charging progress, and indicate which battery is low or dead after you've made the swap... and will even hold an extra SD card for you! Don't let the people complaining deter you.Sure it would be awesome if it would charge wirelessly too, but then it would cost at least $100 more AND be considerably larger, taking up way more space in a camera bag which is heavy and packed enough already.It's like being upset and not eating your birthday cake because the cake doesn't have the ability to feed itself to you so you can eat hands-free.People are also upset that it didn't come with its own charger. Why? You should have extra chargers... especially since its the SAME CABLE that charges the mirrorless camera they probably have that made them consider this item in the first place! Also, modern laptops, notebooks, Android OS phones and tablets, Apple MacBooks, iPads, iPhones, Kindle, portable chargers (which could easily charge this, and your phone or tablet on the go), the Nintendo Switch, Xbox controllers, Playstation controllers, headphones, earbuds, portable speakers, microphones, mouse and keyboard combos, docking stations, desktop monitors, Echo, HomePod, Nest, Roku remotes, smart glasses and pretty much every other up-to-date piece of tech... EVEN household items such as power scrubbers, food thermometers, human thermometers, electric carving knives, indoor security cameras, personal grooming items like hair clippers, rechargeable tools, handheld vacuums RGB lights, can openers, food scales, kids toys, hearing aids, massager guns, heating pads, portable fans, portable hand warmers, flashlights and the list goes on. You mean to tell me you can't find a USB-C cable to spare? LolMy point is, before I bought this item, I would have to carry extra batteries that don't have a dual case so they float all around my bag and I couldn't tell which was dead or charged and wasted valuable seconds missing shots if I guessed wrong, the SINGLE battery charger (which has to be plugged into a wall anyway... so you're better of charging two at a time with this), OR a cable to charge the battery inside of the camera... meaning I couldn't also use the camera. This is a brilliant product. I love it! 10/10 recommend!