The Ansmann Comfort Multi battery charger is a quick-charge device that charges up to four rechargeable batteries, including AAA, AA, C, D, and 9V PP3 - the five most popular battery types. Round cell rechargeable batteries insert into arbitrary charge slots. Each cell will be individually monitored during the charging process and charged to its maximum capacity. The ""PERFECT 7"" charge technology ensures all batteries charge promptly. The seven-step process allows the full performance of the rechargeable batteries. Ansmann has done extensive research and concentrated on various parameters to get the very best out of their battery chargers. It is also incredibly mobile and adaptable to various situations, specifically for image-makers. It can connect via a power bank or a USB port. A simple 'insert and go' process with a bright display for swift operation.