Cressi Magnetic Shaker The Cressi Magnetic Shaker is a hand-held beeper equipped with a special internal magnetic ball system and safety lanyard; light and small in size, it can be easily stowed in the buoy. Operated with a firm downward movement of the hand, it is the ideal tool for calling the attention of other divers during a dive when necessary. Cressi Magnetic Shaker Features It uses a unique magnetic system The 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
