ATmega328 with RF12demo
This is the ATmega328p chip by Atmel, with 32 Kbyte flash memory.
This chip comes pre-loaded with the new OptiBoot 4.4 Arduino boot loader and the RF12demo sketch. The fuses are set for use with a 16 MHz resonator.
This is the same chip as included with every JeeNode kit, it can be used to test the RFM12B, no initial programming or debugging required – just connect a terminal at 57600 baud.
Technical specs can be found on the Atmel website.