Item Type: USB to TTL Module Material: PCB Working Voltage: 5V, USB power supply. Interface: TTL Communication Interface: TXD, RXD Compatible Operating System: For XP, for VISTA, for WIN7, for WIN8, for WIN10. Baud Rate Range: 50bps~2Mbps Working Temperature: -40~85 1Smart Control: Allows for easy switch between electrical isolation and non isolation modes, and the non isolation enables one button power control. 2Reliable Work: Adopting magnetic isolation CH340N chip, the USB to TTL module has has good waveform, low power consumption and high speed as well. 3Higher Safety: The electrical isolation mode ensures 1500V withstand voltage, protecting the computer from external short circuit, shock and so on. 4Better Design: Universal type C USB supports convenient plugging, and the serial adapter board also has 50bps-2Mbps baud rate range for working. 5Wide Matching: Supports 3.3V and 5V SCM systems, and has wide compatibility with for XP, for VISTA, for WIN7, for WIN8, for WIN10, very practical.1. The TTL refers to a level signal with a high level of 3.3V and a low level of 0V. 2. The DCIN input power range is 3.7V to 24V, and the 3.3V input power range is 3.3V to 3.6V. The two power supplies cannot be input at the same time. When DCIN is input, 3.3V is used as output. 3. When the key switch is pressed, the PC5V outputs 5V power.1 x USB to TTL Module