... which are based on electron-magnetic coils. The way it works is by making any hard surface such as wood, ... with a 3.5 mm audio jack, simply connect it to your iPod, laptop, or any other 3.5 ... the flat surface to vibrate and broadcasts the sound. It is lovely. Its image adviser is an excellent ... . As long as the surface is hard and plane, it can sing around, free and relaxed. Specifications: 1. ...