This is the BOSE compact power amplifier IZA190-HZ. I don't know the details, but after researching, here's the explanation: Please check the photos for accessories, etc. #We also have other speakers and amplifiers This is an integrated zone amplifier for commercial applications such as retail stores, restaurants, and conference rooms. It is a reliable 90W Class D amplifier. It is a high-impedance (70V/100V) power amplifier. It is often used for background music playback in stores and restaurants. You can output audio from smartphones and music players with a headphone pin cable. This product was discontinued in August 2025. FreeSpace IZA 250-LZ / IZA 190-HZ integrated zone amplifiers are designed for background/foreground music and paging applications, providing high-quality sound with simple setup and easy operation. Furthermore, you can flexibly expand the system when you need more speakers. When using FreeSpace FS2 / FS4 speakers, you can further optimize the sound using the EQ presets selectable on the unit. High-quality sound: Optimal performance and high-quality sound are achieved through a reliable, high-quality Class D amplifier and internal DSP processing. Easy installation: Setup is possible from the front and rear panels of the amplifier. No computer is required. Opti-voice paging: Automatically and smoothly switches between music and paging signals. Easy-to-use front panel for end-users: Easy to connect devices, adjust tone, and select two sources from the front panel. By using the optional wall-mounted zone controller, you can easily control the volume and source selection from a location away from the amplifier. Compact and lightweight design: The FreeSpace integrated zone amplifier can be installed anywhere, such as on tables, desks, counters, shelves, or in equipment racks (using the optional rack mount kit accessory). It can be used in various facilities and applications such as: Retail stores Restaurants, bars Hospitality Conference centers Schools Lobbies and foyers