Item Type: Grip Strengthener Material: Silicone Battery Type: Lithium battery Battery Capacity: 30mAh (shipped with built in battery) 1Build Strength: Strengthen your grip and forearms with this grip strengthener. It helps to improve hand and wrist strength for better performance in various activities. 2Adjustable Strength: This grip strengthener features adjustable resistance levels, allowing you to customize the strength of your workout. Start with a lower resistance and gradually increase as your strength improves. 3Ergonomic Design: The silicone hand exerciser is designed with an ergonomic shape, providing a comfortable grip during use. The compact size allows for easy portability, so you can exercise anytime, anywhere. 4Counting Timer: The grip strengthener is equipped with a built in counting timer, which helps you track your progress and set goals for your workout sessions. Stay motivated and challenge yourself to get to new heights. 5Muscle Relaxer: In addition to building strength, this grip strengthener can also be used as a muscle relaxer. The repetitive squeezing motion helps relieve tension and stress in the muscles, promoting relaxation and recovery. 1 x Grip Strengthener 1 x Charging Cable