From the manufacturer
Multiple Unique Features Of The Pro Series Magnivisor Deluxe Head Worn Magnifier
Quick-Release Adjustable Headband
Adjustable Headband features a quick-release button, allowing for quick & easy transitions for multiple head sizes.
Adjustable LED Lighting
Adjustable / Detachable Free Standing LED Lamp contains 3 super-bright LED lights. It adjusts about 30° to the right or left and about 90° up and down to allow for adjustable light exposures.
Stand Alone Magnetic Base
LED Lamp contains a magnetic base that attaches to any metallic surface for use as an additional light source.
LED Lamp is powered by 3-AAA batteries.