USB to 2.5mm Audio Charging Cable

Some toys charge through a 2.5-millimeter audio-style jack — the round pin port found on a generation of vibrators and eggs — and this cable exists for every one of them. USB on one end, 2.5 mm mono audio plug on the other: the unglamorous adapter that keeps a drawer of older toys alive.

The physical spec is printed completely: one meter of cable length, 3.5 millimeters of cable thickness, eleven copper wires inside the line, and a 17.4-millimeter needle. Those numbers are the compatibility story — the length reaches from outlet to nightstand, and the pin fits the port standard it names.

If a favorite toy has gone quiet and its charging port is a small round hole, this is the cable class it needs. A spare in the drawer costs less than the toy it might rescue.

• Type: USB to 2.5 mm audio mono charging cable
• Line length: 1 meter
• Line thickness: 3.5 mm
• Wire: 11 copper wires
• Needle: 17.4 mm

One meter, eleven copper wires, one revived toy.