Thin, lightweight, and flexible design perfectly carry with you all day . Drug Free pain relief solution means no more pills! The Cr Wave with Bluetooth Control by App , can be downloaded for iOS and Android.Phone Control – Unlike traditional wired products, this CR Wave TENS EMS device can be controlled through a free Bluetooth App for effortless control while walking, working, reading, cooking, and even sleeping , Advanced App Functions – Timer (10-60 minutes), 25 intensity levels, 8 simulation modes (Circulation, Kneading, Acupuncture, Beating, Scraping, Cupping, Percussion and Acupressure), saved treatment records, and frequency/pulse adjustment