THE SUCTION CUP AT THE BACK CAN BE ATTACHED TO THE BACK OF THEIR SMART PHONE, GLASS, A MIRROR OR ANY OTHER HARD, FLAT SURFACES. CAN ALSO DOUBLE AS A SMART PHONE STAND AND PROP YOUR PHONE VERTICALLY OR HORIZONTALLY. ONCE IN PLACE, YOUR MUSIC IS CLEARLY AMPLIFIED AND PRODUCES CRISP, CLEAN SOUNDS. EASY TO CONNECT TO MOST DEVICES. GREAT FOR YOUR HOME, OFFICE OR OUTDOOR ACTIVITIES. CONNECT THROUGH BLUETOOTH OR USB/AUDIO CABLE. INCLUDES USB CABLE. 2.25" W X 2.25" H