SEALED - Icy Hot Smart Relief Tens Pain Therapy Back &Hip Relief New. New- SEALED ▪︎. Control unit ▪︎. 1 preloaded battery ▪︎. 1 reusable electrode pad. Relieves painful muscles and joints. Same technology used by doctors. Reusable, wire-free and easy to use. Customizable: 63 intensity levels. Prescription strength. Blocks even chronic pain signals. What is Tens Therapy? Tens stands for Transcutaneous Electrical Nerve Stimulation, a method that was once only available to doctors and physical therapists. SmartRelief Tens Therapy is applied right to the point of pain to safely and effectively send gentle waves of relaxing pulses to the underlying nerves that are affected by pain.