The iTENS is a modern day electrotherapy device that merges wearable technology with the effective and lasting pain relief of a TENS unit. The iTENS device is the world's first FDA-cleared, true wireless TENS therapy device that is controlled with an IOS or Android based app. No prescription is needed for this approved over-the-counter, drug-free way to combat pain. The iTENS merges the proven pain relief of Transcutaneous Electrical Nerve Stimulation (TENS) with technology of your smart phone via Bluetooth.