This is the Long Life LED Stick for scuba diving This great light features: High Intensity LED Light with Long Burn Time & Bulb Life Maximum Depth: 330 feet (100 meters) Comes with 3 Batteries LR44 LED Type: Japan Nichia LED Approximate Lamp Life: 50,000 Hours Approximate Burn Time: 50 Hours Light Dimension: 0.42 x 1.97" (11 x 50 mm) Weight (w/ Batteries): 0.33 oz (10 g) Model #DL11 This Mini-Night Light Stick is a perfect companion to keep an eye on your buddy or to let others know where your diving. Dive Safely!