Swatch Twinphone Black telephone, 1989.
Double phone, both parts of the phone work as a phone for two people can be part of the same conversation. It has memory to record phone numbers, pulse or tone selector, redial, button to silence the call and ring regulator.
It works fine, with some noise on the call. It has two cracks in the upper part, visible in the photographs
Measurements: 15x7x7 cm.