Nerve stimulator apparatus, namely, an implantable electrical stimulation device; implantable electrical stimulation device for sacral neuromodulation; neurostimulation system, including an implantable device, a patient remote control to regulate stimulation parameters for the implantable device, and related software that allows for communication between the remote control and the implantable device; system for sacral neurostimulation to treat bladder and bowel disorders, including an implantable device, a patient remote control to regulate stimulation parameters for the implantable device, and related software that allows for communication between the remote control and the implantable device; system for sacral neurostimulation to treat bladder and bowel disorders, including an implantable device, implantable leads, a patient remote control to regulate stimulation parameters for the implantable device, and related software that allows for communication between the remote control and the implantable device; neurostimulation system, including a rechargeable implantable device, a patient remote control to regulate stimulation parameters for the implantable device, and related software that allows for communication between the remote control and the implantable device; system for sacral neurostimulation to treat bladder and bowel disorders, including a rechargeable implantable device, a patient remote control to regulate stimulation parameters for the implantable device, and related software that allows for communication between the remote control and the implantable device; system for sacral neurostimulation to treat bladder and bowel disorders, including a rechargeable implantable device, implantable leads, a patient remote control to regulate stimulation parameters for the implantable device, related software that allows for communication between the remote control and the implantable device, and a charging system including a charging device, a power supply, a charging station and a wearable belt