The Antminer T21 190T is a high-performance Bitcoin mining device offering a hashrate of 190 TH/s with a power efficiency of 19 J/TH. Its air-cooled design ensures stable operation within a temperature range of 0 to 45°C. However, it requires a 380V-415V power supply and consumes approximately 3,610W, which may lead to higher operational costs. Overall, the Antminer T21 190T is a robust option for miners seeking efficiency and durability in their operations.