This is a nicely packaged key FOB that contains a Nordic nRF24L01+ radio and a ATtiny24 for control. Press any one of 5 buttons and the ATtiny24 will wake up, transmit the buttons being pressed, a 16-bit integer value of the total button presses since last battery replacement, and then return to low-power sleep. The simple to replace 20mm coin cell will last for over 3 years. This unit comes fully assembled with battery and enclosure. FOB transmission range is quite nice at over 100ft. Use this FOB to communicate with any nRF24L01+ radio module for your next remote control project. Project description, more information and ordering can be found at https://www.sparkfun.com/products/8602 Datasheet: http://www.sparkfun.com/datasheets/Components/SMD/nRF24L01Pluss_Preliminary_Product_Specification_v1_0.pdf Datasheet: http://www.atmel.com/Images/doc8006.pdf FOB firmware: http://www.sparkfun.com/datasheets/Wireless/Nordic/Nordic-FOB.zip Example receiver firmware: http://www.sparkfun.com/datasheets/Wireless/Nordic/Nordic-FOB-Tester-v10.zip Great Nordic tutorials: http://www.diyembedded.com/ Antenna Calculators: http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=112