Amplifiers; Loudspeakers; Smartwatches; Switchboards; Transponders; Apparatus for recording distance; Audio interfaces; Audio- and video-receivers; Cabinets for loudspeakers; Central processing units (CPU); Computer keyboards; DVD players; Electronic access control systems for interlocking doors; Horns for loudspeakers; Mouse pads; Tape recorders; Telecommunications transmitters; Burglar alarms; Warning bells