Features: Multifunctional switch, dual light source design, high brightness. Built-in large capacity batteries, has long battery life and long service life. Design with hook, can be hung on branches, rods, etc, waterproof, lightweight and portable. Quick release design, you can wear it on your for head, as well as put it on your bike, very convenient. Magnetic block on the back, strong magnetic, easily adsorbed to steel surfaces like car, bicycle, etc. Specifications: Material: Plastic, Electronic Component Size: Approx. 3.8x3.8x2.8 for cm/1.50x1.50x1.10 in Type: Square/Round/for Triangle Battery: 702030 400mAh(Built-in Battery) Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Headlight 1x for Head Band 1x USB Cable 1x Lamp Holder