Data processing apparatus; Data processing equipment, namely, couplers; Pedometers; Time recording apparatus; Optical lantern; Speaking tubes; Filters for radio interference suppression; Telephone receivers; Sonars; Intercommunication apparatus, namely, telephones incorporating intercommunications systems; Global positioning system apparatus; Telephone transmitters; Hands-free kits for telephones; Smartphones; Wearable activity trackers; Walkie-talkies; Wireless headsets for smartphones