Usstore 3500LmT6 LED Waterproof Underwater Diving Head light Lamp Flashlight Torch 9.5 x 7.0 x 3.5cm It is ideal for camping, hunting, fishing, automotive and many other activities. easily attaches to Hat, Helmet, or Head. Model of Battery required: 3x AAA/1x 18650 3.6v/3.7v battery ( not include battery ) Head lamp diameter : 35mm The waterproof rank:IP68:can perfectly waterproof under the water up to 150m Package Include:1 x Headlamp,1xDivingTorch( without retail package)