Quantity   Component name
1 × Your own modified Casette player I'll try to make a tutorial on this later or you can just wing it.
1 × Case This will be 3D printed
1 × Battery(ies) Still trying to decide on this.
1 × Velcro or elastic straps For use as a wearable
1 × LED Fiber Optics / Emitters I would use a smaller one, this will be used to bridge the motor connection so you know the device is on.