Check the listing for details. 2-in-1 Stud Finder with Laser Level, Rechargeable Multi Surface Cross Line Laser. Condition: New. Listed at 49.99 USD. Two bubble vials only work and light up when the Laser Mode is active, not in the detection mode. Class II laser safety product, output < 1mW. Note: NOT designed for use on LATH and PLASTER WALLS. Works best on DRYWALL and WOOD WALLS.