Teensy with mini USB host shield (chineese) | Teensy Forum
USB 2.0 Cable - A-Male to B-Male for ESP8266 Web Server Serial Port WiFi Shield Expansion Board ESP-13 (Specific Models Only) - 10 FT/10 PACK/CLEAR - Walmart.com
RFduino - USB Shield - DEV-13209 - SparkFun Electronics