Type | Typical current | Advantages | Disadvantages |
---|---|---|---|
Invasive | |||
 Implanted | 25 mA | High stimulation specificity | Require surgery |
Suitable for long-term use | Placement cannot be modified after implantation | ||
 Percutaneous | 25 mA | High stimulation specificity | Require surgery |
Suitable for short-term use | Â | ||
Non-invasive | |||
 Transcutaneous (surface) | 2 mA–120 mA | Do not require surgery | Unsuitable for stimulation of deep muscles |
Easy to reposition | Often require higher stimulation current |