We've got a sizable stock and assure the quality. All control boards will undergo arduous tests right before cargo in order that consumers obtain competent and functioning control boards. A：Hi, thank you to your message. Be sure to get in contact with our sales manager by way of WhatsApp at https://johnathanalzjp.blogofchange.com/38186845/a-secret-weapon-for-is-antminer-worth-it