The model is 810 Polygones and is made with 1 material using PoiyomiToon7.3.050.
Drag&Drop the prefab on your avatar, press "Install", then feel free to reposition the wire or model on your avatar. You can install 2 independent cables, one on each arm.

The script handles Expression menu and paremeters as well as your avatar Controllers (Gesture and FX). Plus you can toggle ON/OFF these options before installing:
"HUE shift" will allow you to change your wire color;
"Two hands" will allow you to hold the wire with your other hand, either from a set gesture trigger or as always ON;
"Floor collider" will add a plane collider under your avatar so the wires will rest on the ground;
"Custom gestures" will add a gesture to your Gesture Controller, so that your hands will hold the wire when it is ON.

The package contains a Demo scene with a Kyle robot equip with two cables, all set for an upload. It also contains all necessary templates to manually make the system (you'll mostly need to copy/merge files) in case scripts get outdated by VRC's updates (although I'll do my best to update the package if that happen).