With its built-in SD card slot & USB port, the Spirit SD Stereo is made to work with multiple formats including the teacher-tested CD player, cassette recorder / player & AM / FM radio. It is built for high-use environments with shatterproof, ABS plastic for durability & safety. Stereo is ideal for group or individual reading activities, literacy, ELD, ESL & other language learning programs. Built-in mic records student responses. Steel grills prevent accidental damage to recessed speakers. Stereo features a top-loading CD player tailored for school use & top-mounted, 3.5mm headphone jack for individual or group use.