Shield TENS Unit Electronic Massager Imagine rapidly overcoming the muscle, nerve, and joint pain that dominates and dictates your life. Powerful and reliable Lithium-Ion Rechargeable Battery provides hours of uninterrupted relief. Fits in your hand or pocket, so you may enjoy freedom from pain wherever you go. Built with safety in mind, these units have been FDA cleared for over the counter use. The ONLY Massager backed by a Lifetime No-Hassle Free Replacement Guarantee!