The Kinesis Low-Force keypad includes a 2-port USB hub and utilizes the same low-force and tactile key switch used in contoured keyboards - adding to both comfort and operating life.The Kinesis Low-Force keypad allows users flexibility in positioning the keypad to the right or left of the keyboard. It's perfect for narrow keyboards like the Kinesis Freestyle, and Maxim or in conjunction with your laptop. Use it in any situation where a stand alone keypad is preferred. The 2-port USB hub enables you to easily connect other input devices such as mice without having to access USB ports on your computer.

Used myself for about 3 days light use.  No longer needed.