Package contents: Keyboard (K220), mouse (M150), USB receiver, batteries, and user documentationThe compact keyboard-and-mouse combo with all the standard keys, extended battery life and reliable, long-range wirelessMuch smaller design, same keys, advanced 2.4 GHz wireless, 128-bit AES encryption and whisper-quiet keys.
Update 29 Aug: Price drop from $10.69 to $10.
Great deal, only issue I do not like is no on-off switch on mouse but the device may handle that issue.
After the cost of the batteries the hardware would only be $8 or so.