Apparatus for wireless transmission of acoustic information; Audio equalizer apparatus; Chargers for smartphones; Digital sound processors; Distance measuring apparatus; Electronic devices used to locate lost objects employing radio frequency; Global positioning system receivers; Headphones; Magnetic object detectors; Metal detectors; Noise cancelling headphones; Radiation detectors; Radio-frequency antennas; Rechargeable batteries; Selfie sticks; Sound recording apparatus; Telescopes; Transmitting and receiving apparatus for radio and television broadcasting and for long-distance transmission; Walkie-talkies; Wireless chargers