Technology: simple, in addition to traditional speaker diaphragm
Energy consumption: only 1W, 2 on 7th battery lifespan for more than 10 hours, can also use USB cable to take power through computer
Portability: audio input lines can be incorporated, lightweight
Practicality: magic PU paste shock head can stick to most surfaces, even vertical angle and can be permanently used repeatedly
Sound: appropriate objects, such as in cardboard box, better bass
Volume: with various volume of medium will be various, greater media louder