Portable device earphones with anti-sound leak design. These are essentially the same as the Aiwa pipe-phone model HP-V061. The 1-3/16"(30mm) long brass acoustic pipe that is built into these boosts the bass response, which is where other earbud type headphones are sorely lacking. The published specs for these headsets are; 10Hz to 25KHz, impedance = 22-32 Ohm, with a 1.1 meter cord that has a 3.5mm stereo plug. Manufacturer is ER, Model HE133.
The product datasheet is available here to view
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