A key fob assembly comprises an electronic circuit comprising a substrate carrying a plurality of switching elements and a display element. A rear casing member having a first outer rim and receives the electronic circuit. A front casing member has a second outer rim, a plurality of button apertures,...http://www.google.com.hk/patents/US7034238?utm_source=gb-gplus-share專利 US7034238 - Wireless key fob for vehicles
