Voltage:1.9v-5.5v (wide voltage of 3.3v/5v can work) Running speed: 1T (8-12 times faster than the traditional 51 single chip microcomputer) [Writing method] The program is completely compatible with the traditional 51 single-chip microcomputer, but some new functions are added to improve the running speed and avoid the process of learning from scratch. Hardware: 6pcs io ports, EEPROM, 128 bytes RAM 2pcs 16-bit , 6 channels of AD and 3 channels of PWM 12k storage space, serial port, hardware iic, spi, etc. Color:Black Material:PCB Package Contents: 1 * module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.