A portable charging device includes a housing having a space for receiving the mobile phone and having one or more prongs for plugging to the mobile phone, a circuit board secured in the housing, a speaker coupled to the circuit board for generating sound waves, and a battery engaged in the housing and...http://www.google.fr/patents/US6552513?utm_source=gb-gplus-shareBrevet US6552513 - Portable charging device for coupling portable phones to vehicle and for attaching portable phones to user
Portable charging device for coupling portable phones to vehicle and for ...
