National (now Panasonic) portable tape recorder RQ-190. Operates on an AC cable or four size-D batteries. Features: * Solid-state system using transistors By using transistors instead of vacuum tubes, it achieves a compact, lightweight, and power-saving design. Convenient for carrying around. * Open reel system This type uses magnetic tape wound on reels, offering the unique charm of analog recording. * Recording microphone included An original microphone, presumably from the time, is included. * Operation diagrams on the inside of the lid, with instruction manual The inside of the lid clearly illustrates the operating and connection methods with diagrams. Also included is a paper "User's Guide." Condition: * Power turns on, and the reels rotate, but the rotation is slow, possibly due to not being used for many years. * Rewind and fast forward functions are believed to be working correctly. * Tape is included, but detailed operations such as recording and playback have not been confirmed. * Microphone operation has also not been confirmed. * The exterior shows signs of wear and minor scratches due to aging. Accessories: Original empty reel, No. 3 standard tape (with reel, made by Sony), original microphone (with many scratches), instruction manual (with circuit diagram), registration card. For those considering a purchase: This item is being sold as-is. Recommended for those who intend to repair or maintain it, or for those who want to enjoy the atmosphere of a retro device. No operational guarantee is provided.