300mm 2 digit 3 colors countdown timer

300mm 2 digit 3 colors lane countdown timer, it works with vehicle traffic lights red yellow green.
If you want to know more, please contact me, thanks.
Wechat / whatsapp: 008613418549897
Skype / email: josie@nobleled.com

Видео 300mm 2 digit 3 colors countdown timer канала liao josie