Xcellon Wireless Solar Keyboard for Windows XP, Vista, 7, or 8 2.4 GHz 33ft 15.7 x 5.7 x 0.39 Integrated Solar Panels | 2.4 GHz Frequency | Maximum Wireless Range of 33' Charges From Any Bright Light Source | Ultra-Thin Design | Discreet USB Nano Receiver Plug-and-Play Functionality | Windows XP, Vista, 7, 8 | No Battery Hassle Includes: Limited 1-Year Warranty, ML2032 3.0V Rechargeable Battery, Nano Receiver, User Manual