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Heartless Machine by Christopher Locke; Walk The Plank is an acoustic impedance coupler. The horn is supported by a single long piece of steel, welded to a single long (and very heavy) base. There's a delightful springiness that echoes the tone arm on a vintage turntable. This horn will make the sound from your iPhone louder and richer, using no electricity, wires, plugs, or batteries. The shape of the horn is enough to add 25 decibels or more.
Note 4 Ultrasonic accessory will help visually impaired users to walk around
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The velocity of ultrasound in bone is 4080 m/s, in contrast to muscle where it is 1568 m/s. The high acoustic impedance of bone attenuates the energy carried in the ultrasound signal.
Spiral Acoustic Hollow Air Tube 3.5mm Anti-radiation Headphone Earphone with Mic. It uses the principle of acoustic air-conduction sound tube, so that the radiation away from the vulnerable brain, no radiation within the ear and other electronic devices, the radiation effect is more likely to convince people, and the new 'Intelligent switching mode' Module that allows you to bid farewell to switch wiring troubles. Specifications: 1. Plug: 3.5mm 2. Impedance: 32?±20% 10MM 3. Frequency Range…