It is normal for the hash rate to fluctuate around ±5%. No refund and return after the payment.
Product Description: Machine
HASH: 56TH/s±5%
Wall power consumption: 60W/T±10%
Cooling fan: 2PCS
Power Supply Unit: WhatsPower P21AC200V-300V, 3500W
Controller: included
Operating Temperature: 0C~40C
Dimension: 390mm * 155mm * 240mm
Weight: 12kg
Network connection: Ethernet
Package: 1 piece WhatsMiner M21S 56T With PSU BTC BCH Bitcoin Asic Miner