The NM-usb-chain is a NMMiner Offical development board. At first glance, you may think it's just an ordinary ammeter, but in fact it's also a lottery ticket. It can not only provice the precise current measurement, but also achieve the same high Hashrate 117KH or s as other ESP32-S3 devices. Most importantly, the nm-usb-chain includes a male USB-A port and a female USB-A port. Multiple usb-chains can be connected in series to form a lottery chain, which is really interesting. Of course, this is not all of the nm-usb-chain functions. Daily work and life current monitoring. Lottery when charging your phone. Double your lottery device hashrate without any power supply device added. Such as usb-chain and T190, usb-chain and T Dongle S3, etc. Colour:random, don't accept the specified color Material:plastic Due to different product batches, the appearance , which does not affect the use Package Contents: 1 x NMMiner 1 x Adapter (appearance depending on batch) 1 x NerdMiner(appearance depending on 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.