1. Function:lighting,keychain, project logo comes out from LED torch to promote your goods; 2. Facture: optics theory, coming out focus, project logo comes out from LED torch by concave & convex mirror; 3. Mterials: with Brass of crust, 13000-15000 wed lighteness Φ5LED, full bright corlorful or black & white lantern side, 4pcs AG3-1.5V batteries or 2pcs CR927-3V batteries; 4. With two-double glass convex mirror; 5. Purpose: shot can reach 15M in dark place, Logo focus with 盡-3M is the best.