SparkFun USB UART Serial Breakout - CY7C65213 - BOB-13830 - SparkFun Electronics
Amazon.co.jp: USB to UART TTL Module, TXD LED, RXD LED, USB UART Serial Adapter Module with Power LED, PL2303TA Onboard, 3 Power Modes, USB Mini AB Connector : Computers
USB to Serial UART 5V TTL Header Cable, UART Interface