We are a dependable enterprise, you can ask for for suggestions from clients in your nation. But you can also look for testimonials on our Facebook web site or Speak to BITMAIN(Nathaniel) for suggestions. Order 2 or more devices to avoid wasting on delivery charges! Speak to our sales team https://get-social-now.com/story6226683/the-2-minute-rule-for-second-hand-z15-antminer