It acts as a mechanical, traction device that stretches the human penis in the flaccid state to make it longer.
The wearer adjusts springs, which pull the penile shaft with the intention of stretching the flaccid penis to become longer.
[1] Adverse effects are not extensively reported in the literature, and they are usually mild and self-limiting, in part caused by lack of patient compliance with penile traction therapy (PTT).
It should not be used if penile wounds, lacerations, or infected zones have not fully healed, and by those suffering certain diseases or disorders.
[2] Aggressive or incorrect uses of penis extenders can cause damage to skin and blood vessels, among other possible issues.