This Bitmain Antminer S21 is a new ASIC Bitcoin miner with a processing speed of 188T and power consumption of 3290W. It is compatible with Bitcoin and uses the SHA-256 hash algorithm. The Antminer S21 is a powerful mining hardware designed for efficient Bitcoin mining. Tracking number will be sent out after item has been shipped approx. 3-5 business days. Due to the volatility of crypto there will be no refunds. You may exchange the miner if it arrives DOA. All miners that needs to be exchanged, needs to be returned in the way you received it with all accessories. Shipping charges will be the responsibility of the buyer if missing accessories. All import & duties fees will be covered by the seller.