Huepar LR-6RG receivers are high-quality laser detectors designed for use with green and red beam laser levels. They feature a plastic construction and a compact size of 5.5" in length, 1.07" in height, and 2.4" in width. With its three-side LED and up/down level indicator, this receiver offers accurate and reliable measurements for various home improvement and construction projects. The Huepar LR-6RG is a durable and efficient tool for professional and DIY enthusiasts alike. I bought these for a project and never used them.