See Brady Products
Microcontroller - AVR ATtiny, FuSa - 8-Bit - 20MHz - 6 I/O - 4KB (2K x 16) FLASH - 256 x 8 EEPROM - 256 x 8 RAM - 2.7 to 5.5V - 20-QFN-EP (4x4) - T&R.