Stable and reliable chipset CP2102 USB specification 2.0 compliant with full-speed 12Mbps. Standard USB type A male and TTL 5pin connector. 5pins for 3.3V,TXD,RXD,GND & 5V All handshaking and modem interface signals Baud rates: 300 bps to 1.0Mbps. Byte receive buffer; 640 byte transmit buffer. Hardware or X-On/X-Off handshaking supported. Event character support Line break transmission. USB suspend states supported via SUSPEND pins. Temperature Range: -40° to +85°. Supports Windows 98SE, 2003, XP, Vista, Window7, Mac OSX , Linux 2.6.x and 2.4.36 Maximum baud rate 115200 perfect support! No longer distressed STC12 Series, STC11, STC15 series Burn!