... Crystal Frame 4. 50,000h life span Product Description: 1. Super Thin Crystal Frame LED light box2. Transparent Borders, Exquisite Crystal3 ... for thickness10. Material for Crystal Frame Application 1. hotel bar, super market, business hall, image sign2. dinning room, subway station, ... . Easy to change poster6. Use LED as light resource, energy saving7. Long life span, you can use them 17 years ...