The CP2104's high level of integration, built-in USB2.0 full-speed function controller, USB transceiver, crystal oscillator, EEPROM and asynchronous serial data bus (UART), support modem full-featured signals, without any external USB devices. The CP2104 works similarly to other USB-UART switching circuits. The USB port of the PC is virtualized into a serial port through the driver to achieve the purpose of expansion. Feature: Built-in USB transceiver, no external circuit breaker required Built-in clock circuit, no external circuit breaker required. Built-in power-on reset circuit. The voltage regulation inside the product can output 3.3V voltage. Meet the requirements of the USB2.0 specification. The SUSPEND pin supports USB status suspension. The asynchronous serial data bus is compatible with all handshake and modulation regulator interface signals. The supported data formats are data bit 8, stop bits 1, 2, and check bits. Built-in 512-byte receive buffer and 512-byte transmit buffer. Support hardware or X-ON/X-OFF handshake. With self-recovering fuse. In the event of an unexpected short circuit, it can effectively protect your downloader and computer USB port. With indicator light, the working status is clear at a glance. Supports both power supply outputs of 3.3V and 5V. Specification: PCB board size: 30.5mm*17mm PCB board color: Blue Chip: CP2104 Support OS: For Windows 98/2000/XP/7/8/10 For MAC OS-9 For X-Windows CE For Linux 2.40 or higher version Package list: 1 * Module 1 * Wire Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product 1、Built-in USB transceiver, no external circuit breaker required 2、Built-in clock circuit, no external circuit breaker required. 3、Built-in power-on reset circuit. 4、Meet the requirements of the USB2.0 specification. 5、The SUSPEND pin supports USB status suspension.