USB TTL Cable
Use this cable to easily connect your Raspberry Pi/microcontoller/WiFi router serial console port – ideal for connecting up to the debug/login console on the Raspberry Pi
It would be nice if the cable included some labeling of the wire probes: black => ground, green => TX, white => RX, red => +5V.
Also it wasn't mentioned in the description but the cable I received has a Prolific chip. Drivers for the Mac can be downloaded here: http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=229&pcid=41