An evolution of Alexander Graham Bell's Photophone, developed in 1880, using a modulated infra-red light beam to transmit audio signals. Though passed over by civilian consumers in favor of radio, one of the photophone's greatest flaws became a massive virtue for military use; because the beam could only hit a single receiver, it was impossible to intercept a transmission without physically obstructing line of sight between the two units, making it one of the most secure ranged communication devices of the era. Measuring 11 inches long and 7 1/2 inches wide, with the Carl Zeiss plaque dated 1940 and a Nazi Waffenamt stamp below the front apertures, a swiveling pintle mount on the underside, and controls on the rear. With a black leather transport case, stamped "Li Spr 80" on the lid and dated 1940 on the body.

Very good, showing some light exterior wear. Optics are slightly hazy. Case shows mild scuffs and scratches. Some components (tripod, power source, headset, etc.) not included, and the device has not been function tested.