Engels Handy Counter AD100 Portability: Small and lightweight (approx. 430g), making it convenient to carry. Power Supply: Compatible with both batteries (4 AA batteries) and an AC adapter (sold separately) to suit the location of use. Size: Width 188mm × Depth 46mm × Height 90mm Product Condition This item has been handled by a person, so please refrain from purchasing if you are concerned about the details or are looking for a perfect product. Please carefully check the condition in the photos. The photos are everything. Please refrain from purchasing if you have any concerns. The adapter is sold separately and not purchased. Regarding operation, it is unconfirmed as I do not know how to use it. There may be some deterioration over time, so please check the images carefully and make your judgment. Thank you.