Bitmain Antminer S21 200th 10 Bitcoin mining rigs, model S21 200th. Used for only 7 months in a conditioned space, protected from heat and humidity. Each unit's monthly income is no less than 850 SAR at today's Bitcoin price. I guarantee them for one month, provided you have a prepared space for mining. Price per unit: 4500 SAR. The model is considered one of the best in terms of income and usage. Special price for those who take the entire quantity.