Lack of conservatism and over-optimism on depth specs have generated in the past many returns due to leakage on waterproof units. Lesson learned at FTP!! The initial design of Impulse AQ was to completely fill the enclosure and battery pack with SELF-HEALING NON-CONDUCTIVE GEL, thus, giving 100% guarantee against any leakage. This design  has been rejected because of the extra weight due to the gel. Now, the covers of the enclosure and battery pack as well as the back of all exter