Could you state more about the product? It is not good to show the price only, at least how do they function or work, how will they use it or how they can gain from buying it, no one will just buy it especially when it's their first time to look at it.
Its discount coupon code which you can use to get discount on Bitmain miner official pricing. Bitmain set limit of 1 coupon per order.
I hope it clarifies