Guard your valuable camera against damage while diving with this Moisture Detector from Fantasea Line. Suited for use in any underwater camera housing with enough space (1.5 x 1 x 0.3" / 34 x 24 x 7 mm), the alarm housing installs with no tools – simply affix it to any side panel with the included double-sided tape. The moisture sensor tapes flat underneath the camera or camera tray. Should any moisture get past your housing's seals, the detector will warn you with a blinking LED and a beeping alarm. The detector is powered by an included, replaceable 3V lithium CR1220 battery.