The Heiniger Onyx is a corded animal clipper for professional grooming. It offers two cutting speeds of 2,800 and 3,500 double strokes per minute, giving the user a choice of pace while working through different coat areas.

The textured housing provides a non-slip holding surface. A four-meter power cable with a swivel connection allows the clipper to be repositioned while it remains connected to power. The manufacturer lists a length of 202 mm with the blade installed.

Developed and manufactured in Switzerland, the Onyx is designed with service access and regular professional use in mind. Item 709-303 identifies the US configuration. The fixed power connection makes it suitable for a grooming station where continuous connected operation is preferred over managing removable batteries between sessions.