Mares Magnetic Shaker Scuba Diving Communication Device Dive Reels It also has twin heading

It also has twin heading indicators for alignment of compass course

Available in 3 colors

OceanGlo luminescent floating card absorbs light and glows approximately 7 times longer than other materials

Includes 2 part adjustable mid section

Mares Magnetic Shaker Scuba Diving Communication Device Dive Reels It also has twin headingThe Magnetic Shaker, allows you to alert your companions when you want to. The magnet blocks the metal ball from making continuous annoying noises. The main features of the Magnetic Shaker are: Special magnetic system The magnet avoids unwanted and irritating noises Lightweight and easy to store Easy to use with a simple downward movement