Item Type: Development Board Kit_x000D_ Power Supply Voltage: Power supply on the USB socket or header, the power supply voltage is the same as the working voltage of the chip. _x000D_ Crystal Oscillator: 8M. _x000D_ PCB Board Size: Approx. 7.4 x 3.4cm / 2.91 x 1.34in 1System Board: Compatible with ATMEGA8, ATMEGA48 and pin chips, the routines sent are ATMEGA8 and ATMEGA48, also has 23pcs IO units lead out for easy expansion, no welding required. 2Easy Debugging: Standard ISP download interface, with a self locking switch as well, which can flexibly control the on and off of the input power of the USB female socket of the system, convenient for program download and debugging. 3Power Supply: Can be powered by the ISP download port, can be powered by a standard USB interface, and can be powered by pin headers. 4Simple Using: Externally expand 3 channels of VCC, GND, enables power on reset and button reset, and the externally expand 1 channel of led lights, simplifies debug and use. 5Great Works: 1.6mm thick military grade FR?4 board, with enlarged pads and tin spray treatment.1 x Development Board Kit (16pcs/set)