The 360 m4 bluetooth speaker follows on from the successful vss 006 360bt 360 m3 bluetooth speaker but introduces duel 2 x 22 w speaker power and includes a microsd card slot and volumetrack control the 360 m4 bluetooth wireless speaker remains totally portable standing only 65 cm high with a diameter of 55 cm and contains a 600 mah rechargeable battery that allows playback of up to 6 hrs the m4 also ships with a standard 35 mm line in cable to use with any standard non bluetooth de