Listen to music from your MP3 Player, computer, radio, or even from an SD card with this Aluratek AWS01G BUMP speaker set! This dynamic speaker kit features a primary speaker unit that also functions as a clock, radio and transmitter to all the other speakers in your kit! From the primary unit you can broadcast to up to 6-other BUMP speakers to a range up to 60 feet! So you can enjoy wireless sound throughout your home at an affordable price! This AWS01F BUMP set comes with one primary unit and one slave speaker. Other slave speakers must be purchased separately.