new anti-thief bag luminous school bags for boys student backpack 15-17 inches mochila with usb charging port lock schoolbag y190601

only the usb style with 1.lock 2.data line 3.pencil pocket.the bag that you just received won't shine, because the bag has spent a long time in the dark and no energy..if you want to emit light, you need to absorb light first, such as sunlight, flashlight or fluorescent light..the stronger the light absorbed, the brighter the light..luminous luminescence is continuously illuminated from light to dark and can be recycled..in daylight, the pattern is the same as when it is carried during the day,.