The NM-usb-chain is a NMMiner development board. At first glance, you may think it's just an ordinary ammeter or USB Tester, but in fact it's also a BTC lottery ticket. It can not only provide the precise current measurement, but also achieve the 300% high Hashrate 265KH/s over other ESP32-S3 lottery. 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. With the usb-chain device, you can do that: 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 + T190, usb-chain + for T Dongle S3, etc. Colour:As Shown Material:plastic Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * NMMiner 1 * Adapter 1 * NerdMiner(Heat sink color is random, don't accept the specified color) 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.