Compact portable wireless devices and antennas for compact portable wireless devices are provided. The floating-disk type brake system includes a first floating disk assembly and a first disk assembly that are arranged between the ring gear and the planet carrier of a planetary gear built in a transmission or the like, and the first floating disk assembly and the first disk assembly are pressed together into frictional engagement to brake a rotating shaft. Thus, when the key top is pulled up, the key top is removed together with the first and second link members, thereby facilitating reassembly and maintenance of the key switch device. The accessory lingoes comprise a microphone lingo, a simple remote lingo, a display remote lingo, a RF transmitter lingo and an extended interface lingo.