Electric shavers

An electric shaver, comprising:

• a first hair-cutting unit comprising:
• a first internal cutting member;
• and
• a first external cutting member arranged to cover the first internal cutting member, wherein the first internal cutting member is movable relative to the first external cutting member, wherein the first external cutting member comprises a first skin-contacting area comprising a first plurality of hair-entry openings, wherein the first skin-contacting area is arranged to contact skin during shaving, wherein the first skin-contacting area is annular shaped, and wherein the first internal cutting member is rotatable relative to the first external cutting member;
• and
• a first covering element that comprises a second skin-contacting area arranged to contact the skin during the shaving, wherein the first covering element is arranged on the first external cutting member in a central position relative to the first skin-contacting area such that the first skin-contacting area surrounds the second skin-contacting area, and wherein the first covering element is electrically isolated from the first external cutting member;
• and
• a bi-polar radio frequency (RF) generator unit configured to apply a first polarity RF voltage to the first external cutting member, wherein an entirety of the first external cutting member is configured to conduct the first polarity RF voltage, and wherein the bi-polar RF generator unit is further configured to apply a second polarity RF voltage to the second skin-contacting area.