20 digital i/o port RX and TX
8 analog input port A0 ~ A7
6 PWM port, D3, D5, D6, D9, D10, D11
Using Atmega328P microcontroller
Support serial download and ISP download
Support external 3.3V ~ 12V dc power supply
16 MHZ clock frequency
PayPal uses SSL technology to keep your information safe. In addition, when you send a payment using PayPal, the recipient won’t receive sensitive financial information like your credit card or bank account number. This way, you don’t have to worry about paying people you don’t know.