Features: 1.mini digital vibrating sounder 2.up-to-date design, brief and elegance 3.give you wonderful tone better than any other mini speaker 4.can change every table into a speaker, can put the Piggy on any solid surface, the sound effect is different depend on different material (eg. glass, metal) 5.this magic vibrating technology on some materials brings the good sound effect which is almost the same as the huge speaker system 6.light weight and small dimension, convenient to carry with inside suitcase as business presentation aid 7.small size, attractive outlook, comfortable feeling, and fashionable 8.output: 30W(4Ω) 9.frequency: 70HZ-30KHZ 10.AC adapter: 120V-250V