Used Carter # LGL100A Laser Guide Line Light Turns on and works tag writing on box says slow to turn on but this one comes on the same as the rest that work about 3 sec. after plugging it in. These came from a company that had a lot of rip saws and had a few extra lights on a shelf There are some that do not work and they were not in boxes but as they downsized, they may have removed working ones off the equipment and put in the boxes but that is only speculation. But also, the serial number on the light and the one written on the box do not match. I do not know much about these sold as is. [Please Look at all the pictures they are part of the description] This is from a now closed factory that kept spare parts in stock for their equipment boxes / parts may have some shelf wear, dust / dirt. [B1-F1-R7-S1-3]