The DFX Sports Pro Gyro Exerciser is a compact, portable hand grip strengthener designed to provide a gentle yet effective workout for the hands, wrists, and arms. Features: - The Sports Pro delivers the strength-building power of up to 35 lbs of free weights - without the bulk - Gentle yet effective workout for hands, wrists, and arms that's ideal for beginners and rehabilitation - Builds resistance as rotation speed increases simulating weightlifting without stressing joints - Supports rehabilitation and injury prevention for conditions like Carpal Tunnel, Arthritis, Tendonitis, and Tennis Elbow - Enhances grip strength, range of motion, and overall hand, forearm, and upper body performance - Compact and portable design allows for exercise anywhere, improving hand and arm health and reducing injury risk - NOTE: this product is NOT compatible with the Gyroscope Speed Meter - NOTE: this product IS compatible with the Power Dock and the Power Cord