I purchased this from Shinken Zemi over 20 years ago. Size (approximate): 12cm (W) x 8cm (H) x 2.1cm (D) This allows for easy English study needed for university entrance exams. Includes a set of 3 software cartridges: Frequently Used English Vocabulary Frequently Used English Idioms Important English Sentence Structures Requires 2 AAA batteries to operate. I tested it with batteries, and sometimes it took a few attempts to get the power to turn on after inserting the cartridge. Please refrain from purchasing if you are concerned about its condition, as it is a home-stored, old item. Manual and box are not included. Batteries are also not included. Will be shipped via anonymous delivery with waterproof packaging. Immediate purchase is welcome!