Bionic Ear - 100 Meters Sound Distance + Quality Headphone Specifications Sound Distance: 100 Meters Max Built-in Monocular: magnification x8 Digital Sound Recorder: 12 seconds (new file records over last) Headphone Jack: 3.5mm Power Source: 1x 9V Battery Dimensions - Sound Gun: 175x280x55 (LxWxD) - Sound Dish: 250mm round 60mm(D) - Stereo Headphone: Adjustable Length 160mm~200mm