Lens are adjustable can be as single lens dual lens or tripe lens - LED light is detachable; LED lighting angle can be adjust to left/ right up / down - Headband can be adjust as per your head comfortable to wear - Suitable for checking repairing assembling carving and observing etc. - With LED light bright and energy-saving - Magnification: 1.5X 3X 8.5X up to 10X - Battery: 2 x AAA 1.5V (not included) - Voltage can be increased from 3V to 4.5V by using 2 x AAA batteries to increase brightness of LED light - Battery working time: 30h (brightness won't change) - Battery only has 30% power can work normally when voltage is 1.5V