The Sony STR-K670P is a surround sound AV receiver that has been discontinued. It features 4x75 watts of power per channel, 7.2-channel processing, and compatibility with popular audio and video formats, such as Dolby Digital, DTS, and 4K Ultra HD. It also includes USB connectivity for audio playback from a connected USB drive, and can be controlled using a compatible smartphone or tablet with the Sony Music Center app. Additionally, the receiver includes network connectivity for accessing streaming services and multiroom audio capabilities. The Sony STR-K670P offers a range of features to enhance your home entertainment experience.