Features: Build-in PCB antenna Powered by Pineseed BL602 SoC 2MBytes Flash Serial/UART baud rate: 115200 bps Input power: 3.3V I/O voltage tolerance: 3.6V Max Eleven GPIOs can be used for ADC, PWM, i2C, UART and SPI functions Dimension: 16 x 24x3.1mm Pinenut-12S GPIO Pin Definition Warranty: 30 days