Because the light is on, the shoe does not have a USB interface. It is a battery on the sole of the shoe that emits electricity and light will sometimes lead over time.
It is normal to cause no light, one is bright and one is not bright, or one is bright and the other is dark. If there is a lighting problem, such as different brightness on the left and right, the brightness of the left and right lights will be bright and the other will not be bright, and the color will be uneven. The problem is that we don’t care about quality problems.
Length 13.5 cm in size 21, 14 cm in size 22, 14.5 cm in size 23, 15 cm in size 24, 15.5 cm in size 25, 16 cm in size 26, 16.5 cm in size 27, 28 Length 17 cm in size, 17.5 cm length in size 29, 18 cm length in size 30, 5 pairs in size 21-25, 5 pairs in size 26-30, 19.1 cm in size 31, 19.7 cm in size 32, Length 20.3 cm in size 33, 20.9 cm length in size 34, 21.5 cm length in size 35, 22 cm length in size 36, 6 pairs in one hand for 31-36