Specifications and Features: Small enough to carry in the field, yet powerful enough to use at the bench. The nano light can be stored in a wader or shirt pocket for curing Loon?s UV Knot Sense or UV Wader Repair, but is also an excellent option as an economical light for tyers just getting started with using UV resins. One AAA battery included. UV light for curing Loon's UV resins Portable and durable Powerful enough to cure tying resins Uses 1 AAA battery (included)