1, on-board ADXL345 digital output (to support the I2C/SPI), low-power, compact acceleration sensor; 2, support 5V/3.3V voltage input, onboard RT9161 power chip, faster than the 1117 with lower pressure drop, load the appropriate speed, very suitable for high-noise power supply environment; 3, the common pin leads, pin standard 100mil (2.54mm), convenient for the dot matrix board; 4, the PCB board sided gold-plated, size: 28 (mm) x14 (mm)