Transcutaneous electrical nerve stimulation (TENS) is a therapy that uses low-voltage electrical current for pain relief. You do TENS with a small, battery-powered machine about the size of a pocket radio.
User Experience (UX) Design: Concept Definition. User experience (UX) design is a process of creating products that provide meaningful and personally relevant experiences. This involves the careful design of the usability and pleasure derived from using a product.
An important concept in UX design is the process by which users form experiences. When a user first encounters a product, a momentary impression is formed. This momentary impression evolves over time, typically as the product is used throughout a period.