Mighty Dwarf BLUE 7 Watt Multimedia Vibration Speaker. The Mighty Dwarf 7 Watt has 40% more power than the original 5 Watt speaker. The Mighty Dwarf 7 Watt has upgraded microSD playback capabilities including randomized playback (shuffle). This speaker can connect to any of your electronics using the standard 3.5mm earphone plug. The speaker can also play .MP3 or .WMA files stored on a microSD card (up to16 GB not included).