BIGBLUE HL450XW is a wide light distribution underwater headlight that uses 3 AAA batteries. 450 Lumens Push Switch for 4 Dimming Settings It also has SOS flashing mode and can be dimmed even in water. Super wide angle of light distribution with a 120° illumination angle, making it ideal for hand work or underwater photography. Equipped with 2 super bright red LEDs that have approximately 100 lumens. Suitable for photography such as coral. With high waterproof performance, the body is made of aluminum alloy base and is made of lightweight, durable and corrosion-resistant polycarbonate resin. The battery cap has a double O-ring construction. Reliable and durable construction with a pressure resistance of 328.4 ft (100 m). The light head can be moved up and down by 180°. There are no lenses or reflectors to fly the light forward, so you cant light it far away. However, if you close it, you can see a wide and even light. Provides close to natural field of view with nearly no blind spots. The switch doubles as a battery indicator and the color indicates how much battery is left. Push the switch to turn on at a time to turn on. When you push it once for 5 seconds or more, it will light up at 450 lumens. After lighting up, press the switch within 2 seconds to adjust to 4 levels. Cycle in order of Hi→Med→Low→Mini→Off→Hi…. Long press the switch for more than 2 seconds to switch to SOS flash. Press the switch again to return to normal lighting mode. Press quickly 2 times in the light off state to enter red mode. Push the switch again to release. The headband is a thin silicone band. It can be worn as a wide band around the back of the head. It is non-slip and sticks perfectly to diving, wet suits, helmets, etc. It weighs 6.3 oz (189 g), but it is buoyant in water, so it will be lighter up to 2.0 oz (56 It is especially suitable for underwater photography. Previously you need to pin out your pin with your hand lights or lights on the housing, but you dont have to do this with these headlights. Easy to focus on what you see This is the most authentic underwater headlight youve ever seen. This wide angle light distribution is overwhelming.