Pen mouses, electronic pens, electronic pens for use with computers, electronic pens for use with notebook computers, electronic pens for use with personal digital assistants (PDA), electronic pens having function of mobile communication, radio receivers, portable telecommunications apparatus, sound recording and reproduction apparatus, MP3 players, microphones, recorded computer software, recorded computer operating programs, recorded computer programs, transmitters of electronic signals, computer mouses, mouse pads (computer peripheral), light-emitting electronic pointers