Features:   1. All 32 I/O pins are pulled out.  2. The classic ATmega16 microcontroller minimum system eliminates the hassle of soldering. 3. Crystal: The socket hole is convenient for soldering to replace the crystal, crystal 8M.  4. Support chip: ATmega16 MCU / ATmega32 chip is pin compatible.  5. Power: power adapter or external expansion pin power supply (not supported by ISP download interface).  6. DC-005 power module (supporting the transposon is 5.5 * 2.1 mm).  7. Expand the outer 4 channels VCC, GND.  8. Reset: Power-on reset and reset button.  9. Power indicator (D1) and program run indicator (D2).  10. Standard ISP download interface.    Specification:   Weight: 46 grams.  Color: as the picture shows.  Specification: 88mm*38mm (approx.).    Note: This minimum system development board does not have an AVR chip, you need to purchase additional chips. Package includes: 3 x Development Board