4 X 370and or S (Total about 1500KH or s) Miner Combo Kit! The USB Hub powers the USB cable. It is recommended that customers plug in the Power plug before use to sufficient power!(Power plug not included) Customers are advised to use a fan to blow air from the side to achieve better heat dissipation and maintain system stability.(Fan not included) High efficiency: Low consumption greatly reduces your cost! Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:Gray and Black Material:PlasticandMetal Package Contents: 4 x Miner(the color of the pin sleeves is random, and the designation is not accepted. appearance from batch to batch) 4 x USB Adapter (appearance from batch to batch) 1 x USB HUB (appearance from batch to batch) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.