1x ATmega328P chip for Arduino Duemilanove， bootloader burned inside is available now from our US warehouse Free shipping to US in 3-6 business days ship to Canada， Brazil in 7-10 days 8-Bit MCU ATmega328P-PU DIP28 Microcontroller IC Chip For Arduino Specification: Model: Atmega328P-PU Dimension: 34 x 9 x 8mm Maximum clock frequency: 20MHz Working voltage: 1.8V to 5.5V Maximum working temperature: +85 C Minimum working temperature: -40 C Interface type: I2C， SPI， USART Package included: 1 x Atmega328P-PU chip