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The unit did not have any weird vibration to it. You can attach it to wrist strap, if you are really concerned about the gyro ball flying away. The dominant hand/arm was easily able to keep the gyro ball going, that it will help refine your fine motor skills in that non-dominant hand/arm.

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【SMART WRIST BALL】Our wrist ball can be connected to Bluetooth. Download our sports APP, you can intuitively view detailed data (including training

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