Monoprice USB-C Male to Micro B Female Adapter, Black
This USB-C to Micro USB Adapter allows you to use the more common, and generally less expensive, Micro USB cables and chargers with your USB Type-C enabled mobile device. It measures a scant 0.9" x 0.4" x 0.2" (21.7 x 11.0 x 5.5 mm) and has gold plated contacts for smooth, corrosion-free connections.
Lets me use all my old android phone charge cables with my new Galaxy S8 perfectly. Not sure about hi-speed charging since the signal still has t o pass through the old micro-B connector to get to the adapter, but, my S8 still charges perfectly.
Maximize using what you have without duplicating it.
I ordered these adapters because I have plenty of cords with micro B male ends but only one with USB-C. And they are not readily available and can be pricy - USB-C. I bought 3 and use 1 in my vehicle, and one in my house on a long cord, and keep 1 in my emergency bag. Great thing is I can use the cords now on 2 different unit types.
I have had these for a while now and they are performing well. I use them to charge my new Blackberry KEYone Android phone and they are doing well at that task. They seem to be well constructed and at this point, I haven't seen any seams in the plastic that might come apart in the future as I experienced with some cheap mini to micro usb adapters I have used in the past.