Acoustic couplers; Acoustic membranes; Camcorders; Cameras; Covers for smartphones; DVD players; Earphones and headphones; Headphones; Joysticks for use with computers, other than for video games; Loudspeakers; Megaphones; Portable media players; Radios; Rechargeable electric batteries; Smartphones; Smartwatches; Sonars; Sound recording apparatus; Sound reproduction apparatus; Tablet computers; Television sets; Transponders; Wearable activity trackers; Acoustic membranes; Audio-receivers and ...