... blank, market, a large space.4. Quality:LED fiber optic light shoe, is optical fiber, and better quality than the EL luminescent shoelace ... Shoelaces compared with the EL cold light:LED fiber optic light shoe, is optical fiber, the quality is better than the EL luminescent ... the battery light is still the same6. Metering principles:Because fiber optic light guide, it will receive the impact of ambient ...