100% brand new and high quality 14 Digital input/output ports RX, TX D13, D2 ~~ of, or 8 analog input port A0 to A7 The TTL level serial transceiver port RX/TX 6 PWM ports, D3, D5 , D6, D9, D10, D11 Using Atmel Atmega168P microcontroller supports serial download Support for external 5v~ 12V DC power supply Support 9V battery-powered clock frequency 16MHz Dimensions:33.3 x 18.0 (mm)