Built-in a new CH340G original chip, which handles all the USB signalling and protocols. TTL levels of 5V and 3.3V adjustable design, and draws power directly from your PC/laptop via the USB connection, no need for an external power adapter. | Provides access to UART Transmit (Tx), Receive (Rx), RTS, CTS, VCC and GND connections; POW(power), RXD/TXD transceiver communication LED indicator design, which can show serial adapter status and data activity at a glance. | Windows 8 and above OS, Linux and Mac OS will install FTDI driver automatically, but NOT compatible with Chrome OS. | What you get: 1 x USB to TTL Module + 1 x Jumper, which are packed by antistatic bag.