LI-NING 100kg Power Ball Self-Starting Color-Changing LED Wrist Grip Strengthener for Men and Women, Arm Exerciser, Student Stress Relief Wrist and Arm Muscle Trainer

Self-starting mechanism requiring no external power source

Pure mechanical design utilizing centrifugal force generated by wrist rotation interacting with an internal ball core

Silent operation with noise reduction technology

Compact size with powerful output

Equipped with silicone anti-slip ring and spring steel self-starting strap

Safety wrist strap included to prevent accidental release during use

High precision internal floating ball core and track system for smooth rotation

Office workers experiencing wrist fatigue from prolonged mouse use

Mobile phone users with overuse-related wrist discomfort

Fitness enthusiasts with wrist stiffness and soreness from training

1. Wear the dedicated wrist strap to ensure safety and prevent dropping.

2. Press the ball core with thumbs and push in the indicated direction until resistance is felt and the core cannot roll.

3. Quickly release thumbs to allow the ball to spin.

4. Rotate the wrist using side-to-side or circular motions to maintain and increase speed.

Do not shake the ball empty-handed or apply excessive pressure on the core to avoid damage.

Avoid irregular or vigorous shaking after starting, which may increase noise and hinder operation.

The product is a high-precision device; dropping may cause irreparable damage.

Do not apply any oily or lubricating liquids inside the ball.

Do not attempt to stop the ball with body parts during high-speed rotation to prevent injury.

The self-starting elastic mechanism allows easy activation by simple push and release.

The product is a meaningful gift symbolizing care and companionship.