Features & Specs: Output: 450 Wavelength: 520nm Color: Green Adjustability: Focusable / Threaded Lens Switch: On-Off Material: 304 Stainless Steel, Polished Power Source: 2x16340 3.7V (Case Positive)   Glow Vials 🧪 (Optional): Glow Vials are inserted into the cutouts near the top of the Steel body of the Valkyrie laser and can be charged with UV or visible light (such as a Flashlight).   Designed by Tinker in United States. Engineered in Greece. "Valkyrie" product photographs are captured on Canon EOS R7 at 32.5 MP. Color accuracy achieved using unedited sensor data for 97% of available "Valkyrie" photographs. Some photographs may be taken using a UV Lens Filter....