This ACR Man Overboard Locator's ultra high-intensity flashing LED light automatically activates for over 20 hours when it comes in contact with salt or fresh water, and can be deactivated simply by pushing the red button. • Activation Method: Automatic/ Manual• Type: LED Flashlight/ Strobe Light• Function: Automatically Activates For More Than 20 Hours When It Comes In Contact With Salt/ Fresh Water• Operational Life: 20 Hours• Battery Type: 2 AA Lithium Battery• Dimensions: 1.19 Inch Width X 1.13 Inch Depth X 2.44 Inch Height• Waterproof: Watertight Up To 10 ft (3 meters)• Certification: USCG/ SOLAS/ CE/ Transport Canada Certified Automatically Activates For More Than 20 Hours When It Comes In Contact With Salt/ Fresh Water LED Flashlight/ Strobe 1.19 Inch Width x 1.13 Inch Depth x 2.44 Inch Height | ACR Electronics ACR Man Overboard Locator in Red