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People used to check whether the bicycle tire needs to be inflated by pressing it. If it can be out of shape or flattened easily, that means the tire pressure is low. Now the flash valve core offers you a more convenient and clear way to inform you if the tire need to be inflated. The valve core can detect the tire pressure and if the tire pressure decreases, the light turns from green to red. Also, the light can provide a safer riding at night.