These are old-school bookshelf speakers- they are NOT powered and do not have Bluetooth connectivity. You need to hook them up to an amplifier with cables. They are surprisingly good for their size and age. They were used with an old turntable which has since died. The speakers still work as new. You can use these on a surface or there is a recess on the back where they can mount on a wall. Measures 6 3/4 inches high, 4 inches wide and 5 inches deep.