A hand-operated, non-sterile, magnetic device designed to be used by a patient to switch an implanted stimulator (e.g., a neurostimulator that can be controlled by a strong external magnetic force) on and off. It typically consists of a small portable magnet (e.g., strontium ferrite) coated with an epoxy that can be carried in the pocket or a handbag (purse) of a patient for convenient access. It is placed by the patient against the skin directly over the site of the implanted stimulator and turned as prescribed by the manufacturer to affect the stimulator. This is a reusable device.