D&H Technology is a subsidiary of HONGKONG YANCHENG GROUP LIMITED. They have over 60k and 100k annual orders of antminer and whatsminer for sales and self-mining with world-wide shipping capabilities. Their warehouses in Hongkong, Texas, Los Angeles, etc., provides the optimal door to door logistics solution. They offer technical support, customer service, and the most flexible payment method. D&H Technology also specializes in mining farm constructions and developers their own hardware/software to improve the mining efficiencies.