Bionic Ear - 100 Meters Sound Distance + 8x Monocular & Quality Headphone Sound Distance: 100 Meters Max Built-in Monocular: magnification x8 Digital Sound Recorder: 12 seconds (new file records over last) Sound Playback - Line in to transfer sound file to tape recorder Sound Band Adjustment: Expands/Narrows the cone of sounds picked up to find particular sounds