... ,Safe Application: 7", 4", 3.5", 2.8" GPS/PDA/3G Phone Cert: CE, RoHS, ISO9001:2001 Product Feature and purpose ... :1. Mainly used for 3G mobile and GPS Phone, GPS, MP3 or other electronic device ... the same time, it is the natural phenomena, when you do not use it, please take down the product.Patent:USA ...