Wrist Cushion for Keyboard by IMAK Dressing Aids Single Channel * Continuous operation Instrument and Solution Stands Single Channel * Continuous operation or work rest prompts * LED visual display * Hand held portability * Carry Case * Convenient 9 volt battery with LED battery check * Easy to operate * Goal types include: Above Tone Below Tone Matrixed Audio Tone and A B Ratio for Dual Channel Systems * Accomodates 3'2 4'6 * The unique design conforms to your keyboard while completely supporting your wrist and forearm in an ergonomically correct position reducing stress in your hands wrists and arms * Freezable for extra cooling relief