warranty service 1. New miner 90 days warranty is provided starting from the shipping date by Innosilicon in accordance with their terms and conditions. 2. We only offer a 15-day warranty on used machines from the time of delivery because used machine is easy be bad than new. 3. If it is a warranty policy, a defective miner can repair it for free; after the warranty period, the machine needs to pay for repairs according to the actual situation. 4. The following events will invalidate the warranty: Customer first removes/replaces any component by itself; damage caused by lightning or voltage surges; scorched parts on a stray board or chip; miners/circuit boards/components infiltrate due to wet conditions Or corrosion and damage. 5. Pay shipping fees when shipping replacement parts during the warranty period 6. If you have any questions when receiving the package, please communicate with customer service