This is the NEW Ultrabright, Cool-White LED Loupe Headlight, from Seiler. It is equipped with an 8 hour rechargeable Lithium Ion Battery Source is the perfect addition to the Seiler Loupes. Adding a light source to your loupes will make a world of difference. It offers the following key features: 1) Four different light intensity settings, 2) an 8 hour battery life, and 3) Lightweight belt clip battery pack.