Based on the paragraph below, what are some potential benefits of TENS (transcutaneous electrical nerve stimulation) treatment?

Transcutaneous electrical nerve stimulation is a commonly used treatment approach to alleviate acute and chronic pain by reducing the sensitization of dorsal horn neurons, elevating levels of gamma-aminobutyric acid and glycine, and inhibiting glial activation.[3] However, many systematic reviews and meta analyses assessing clinical trials looking at the effectiveness of using TENS to reduce different sources of pain have been inconclusive due to a lack of high quality and unbiased evidence.[4][5] Potential benefits of TENS treatment include the safety, relative low cost, the ability to self-administer, and availability over the counter without a prescription.[4] In principle, an adequate intensity of stimulation is necessary to achieve pain relief with TENS.[6][7] An analysis of treatment fidelity (meaning that the delivery of TENS in a trial was in accordance with current clinical advice, such as using "a strong but comfortable sensation" and suitable, frequent treatment durations) showed that higher fidelity trials tended to have a positive outcome.[8]

Some benefits of TENS treatment are the low cost, ability to self-administer (which lends itself to flexibility, and being able to treat at home), and availability without a prescription.