The AQUATEC Scuba Blinking LED Tank Light offers practicality and functionality for scuba divers. Alongside its aesthetic appeal, it features a stainless steel hook for replacing tank valve O-rings, includes 5 cylinder valve O-rings and one AAA battery. Measuring 72 x 26 mm and weighing 28 grams, these LED lights flash continuously for over 30 hours and are waterproof up to 200 meters underwater.