Versatile Training Modes: Equipped with both online and offline functionalities, the ball connects to an app offering over 10 training modes and multiple reaction balls can change numbers to form a complete light-based training system. Dual-System Training: Features an irregularly-shaped ball to boost your response to unpredictability and enhance hand-foot speed. The quick-fire LED lights are engineered to improve cognitive processing, visual acuity, and decision-making skills under pressure. Fully Customizable Workouts: Equipped with various activation modes including Shake-to-Light, Delay-On, and Timeout, allowing you to tailor your training sessions. This flexibility helps you create endless drill combinations to focus on specific skills and avoid training plateaus. Built for Demanding Training: Constructed from premium materials that are sweat- and impact-absorbing, ensuring durability and reliability during intense training sessions. Material: silica gel Power Source: Rechargeable lithium battery Modes: Online and Offline Color: White Package Contents: 1* Reaction Training Ball 1* Storage Bag 1* Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.