This item is a high-quality power supply. It is perfectly suited as a replacement or secondary device and provides your Canon EOS 5D Mark III with power just like your conventional power supply, enabling reliable battery charging. As one of the largest suppliers of batteries, power supplies, and chargers, we have a very extensive inventory, ensuring a high level of availability. Our customers greatly appreciate this high availability, combined with first-class service. Note: Unless we explicitly state that this is an original product, we supply a compatible product. This means it is by no means an original product from the manufacturer and is therefore not produced or recommended by them. All brand and product names are the property of their respective owners and are used solely for compatibility description.