It uses Silicon Labs Si4831 high-performance FM radio receiver chip with a stereo speaker that uses high sound quality digital processing IC. This radio kit allows you to receive FM broadcast in high quality stereo with less parts. The reception signal processing is digital, but the election is made using a volium analog method so it can receive weak radio stations without flying out like auto-scanning radios. It has a wide reception band and can be tuned to a frequency of 90 - 108 MHz, so it can also receive radio waves such as wide FM and commercially available FM transmitters. The speaker and built-in circuit board allow surface space to be used as a picture frame.