Itenstm: the itens is a wireless electrotherapy device that merges modern technology with the proven results of tens therapy to provide effective and lasting pain relief. The device has a softwear to correctly provide frequencies for different body parts. The itenstm is the worlds first true wireless tens device that works with your iphone or android device. The itens harnesses the power of your smart phone with an itens app that wirelessly syncs with the bluetooth based electropathy device. The itens app can be downloaded free from your app store. Itens tm is a fda cleared with medical grade strength silver conductive wings for fast acting + long lasting pain relief Please note Large wings are sold seperately