Review on DIYmall ESP8266 ESP-01 Breakout Board ESP-01S Breadboard Adapter PCB Board Pack of 5pcs - Serial WiFi Transceiver Module by Rick Ross

If you play with breadboards a lot and try to build the latest coolest IoT device, this is a big help for the weird 8-pin ESP8266-01 - the one I do had my fair share of cheap and mislabeled Chinese connectors - it makes it SO easy to hook things up to the breadboard. I've even used it on a raw programmer for identical modules soldered together. It's easy to figure out which way things need to be plugged in, and debugging is just as easy thanks to labels.