Telex Economy HS Boom Headphones, Model A 600-1, are a pair of vintage headphones with a 600 ohm impedance. They feature a headband form factor and ear-cup (over the ear) style, with double earpieces. The headphones are brown in color and have a connectivity of 6.35 mm (1/4 in). They also come with a number of features, including aircraft communications, magnetic headphones, vertically adjustable ear cups, and molded vinyl ear cushions. The boom microphone type is also included. These headphones are still in their original box.