NooElec PL2303 USB to Serial (TTL) Module/Adapter with Female and Male Wiring Harnesses & Test Jumper. Compatible with Windows 98 through Windows 7; Mac OS 8 through OS X, Linux and Android! Includes USB module, 20cm female-male jumper set, 20cm female-female jumper set and test shunt Compatible with 32-bit & 64-bit Windows, Mac OS 8 to OS X, Linux and Android! To test the unit use the shunt to connect TX and RX (loopback test) 3.3V and 5.0V outputs are available to power your project directly from the adapter