- Uses a special magnetic system
- Magnet is located inside on either end of the shaker with a ball bearing in between
- Shaking the device moves the ball bearing, creating a loud echo sound underwater
- Great for underwater communication
- A useful underwater safety device
- Uses a special magnetic system
- Magnet is located inside on either end of the shaker with a ball bearing in between
- Shaking the device moves the ball bearing, creating a loud echo sound underwater
- Great for underwater communication
- A useful underwater safety device
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