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Is it normal to have a slight electric shock on the face and feel a slight stinging sensation on the
Normal. This is because the Ruby Ice Heat RF is equipped with Ruby Slow Current, which stimulates muscles to contract repeatedly through the slow current, exercising muscles and achieving the effect of lifting and tightening. When using the V-LEVEL lifting and RF radio frequency modes, there may be a slight tingling sensation when the ruby gold surface comes into contact with the skin, which is a normal phenomenon. Due to the varying levels of skin sensation among individuals, it is recommended to gradually adapt from low to high levels until reaching strong and high-end currents.