I continue to use my older Sony cameras that take the NP-FZ100 batteries and recently had to get some more of them. So when I saw this – and that it’s K&F Concept, a company with an excellent reputation for photography-related products – I ordered it. It was delivered only a few days later in excellent packaging and brand-new perfect condition. This is an amazing and well-built - of the usual tough/sturdy ABS-like plastic - 4-battery charger. It has all the over-charging, overheating, over-voltage, over-current and other protections as well as bright indicator lights outside showing the charge status of each battery. It’s fast-charging too, so I use my 65W charger block with this to get the maximum benefit. It's recommended that at least a 40W black be used. Before I would very occasionally run out of fresh batteries with my previous two-battery charger. But now that should be a never event. Both my OEM and 3rd-party batteries fit and charge up well in this device. It could not be easier to use. What’s really great about this too is that it’s got USB-A and USB-C outputs so it’s literally made to function as a power bank to charge other devices in a pinch. Or, when this is plugged in, I don’t need another charging block for charging those other devices as pass-throughs. Plus it’s even got slots for keeping SD memory cards. Yes, it’s a bit bigger but not in comparison to my longer lenses, tripod and other gear when I travel with those. There are few other comparable products out there and the ones most similar are more expensive compared to this one’s $49.99 list as of this writing making this charger an exceedingly good value.