This is a superb tool for anyone who needs a hands-free, ultra bright light source! This cap light features 5 LED lights mounted in a lightweight plastic frame that clips to a baseball caps brim. This item is designed to withstand extreme conditions and rugged use. The unit is water resistant, and the lithium cell batteries lasts up to 48 hours of continuous use (batteries are included). Ideal for barbacks and bartenders when going into coolers, stock rooms and other areas of the venue that tend to be dark... the Cap Lite has 4 fun and different light patterns and a multi-mode light switch. Requires 2 lithium cell CR2032 batteries (included). Measures 3 1/4" x 2".