The Bright Star LED system offers a number of headset viewing options, and features both an adjustable knob and cushioned Head Loupe for greater comfort and convenience. Featuring bright, direct, LED light, dual pivot points, an on/off switch, and powered by AAA batteries (included), the headset is available alone or with +1.5, +2.0 and +2.5-range clip-on magnifiers, which is also available separately as an add-on accessory. Offering another alternative is the Bright Star LED Clip-On, which attaches easily to eye and safety glasses. Light, comfortable, and with a clip-on battery case, the Clip-On has a coated clip to prevent scratched lens