I was approached by a white shark while surfing at Surf Beach, California which is notorious for having had 4 shark attacks, two of them deadly. I have FFREEDOM+ Surf installed on my longboard. I could not see the full shark under the water but the dorsal fin was fully out of the water and was about a meter tall, a solid dark grey and a notch at the base. It seemed to be an adult. The shark quickly approached to about a meter from me and then quickly went a half circle around my board and then away, all while thrashing a lot of water around. I was a good distance from shore and in the five to ten minutes it took to paddle back, I did not see the shark again. I feel the FREEDOM+ Surf likely deterred the shark and likely saved me from harm.
Also I want to add that I am impressed with the device's ability to hold charge. I found it can maintain a charge for several months of not being used.