Warranty: 1. A 180-day warranty is provided starting from the shipping date. 2. All sales are final. No refunds will be granted. Defective miners can be repaired for free if they fall under the Bitmain warranty policy. After the warranty period, machines can be repaired at the cost of parts and labor. 3. If you notice there are some loose heatsinks when you receive the miner, please inform us by email. com within 3 days from the date the package is received according to UPS/DHL/FEDEX's website. 4. We does not take any responsibility for or compensate for any loss as result of downtime caused by delays in transportation as a result of custom formalities or other reasons.