Features: 1 Super compatibility. Full support for Win8For Win7For WinXpFor Win2KFor WinCEFor LinuxFor Mac systems 32 64 system. 2 Ultra-small size: the board is only 3.5*1.8cm.Even in those two USB ports on a very tight distance laptops can easily be placed side by side two. 3 Power output: you can use this module to the microcontroller system power supply convenient debugging. 5V-500mA or 3.3V-100mA. 4 Overcurrent protection: on-board self-recovery fuse even if the positive and negative short-circuit will not damage the circuit board or computer. If there is a short circuit or current exceeds 500mA the fuse will automatically disconnect to be restored non-shorted state circuit fuse back to normal. Effectively protect the security of your computer. 5 Four levels of freedom system conversion: a unique circuit design USB TTL RS232 RS485 freedom conversion switched by the switch to achieve physical convenient and reliable without interference. 6 Transceiver indicator: When serial line to send or receive data line transceiver board LEDs will light easy to debug. 7 High-speed communications: Baud rate up to 2Mbps. 8 3.3V and 5V output compatible. Specifications: Kernel Chip: CP2102 Size: 3.5*1.8cm Compatibility: 3.3V 5V output Power Supply: 5V-500mA 3.3V-100mA Over Current Protection: Yes Working Indicator: Yes Interchangeable: USB TTL RS0232 RS485 Max Baud rate: 2Mbps Material: Plastic Copper Main Color: Blue TTL Level Interface: TXD.RXD 232 Level Interface: 232T.232R 485 Level Interface: A.B 3.3VVoltage Output: 3.3V +5V Voltage Output: +5V DTR Output: DTR RTS Output: RTS Net weight: 3g Package includes: 1 x Multi-function Serial Interface Module Converter CP2102