first time i used it i was kayaking. A bag with a mobile phone, keys and wallet slipped out of the boat after a panicked search for several minutes (next time I'll use headphones). I found it thanks to the bright orange chicken at the bottom of the lake. I realized my phone was gone, but I was glad my keys and wallet were back with me. To my delight, everything was bone dry! The people who helped me find it were impressed and went for it themselves! Good product!