This is FTDI Chip Model with LED's per port for TX and RX and Power. Features Specification Bus powered 1 USB to 4 ports RS-232 Standard USB To 4 RS-232 Adapter Easy to install , Plug & Play PDA RS-232 Port support 56K Modem support Serial Mouse support Serial PC camera support Max speed: 9,600 up to 230,000 bps RS-232 for DTE Mode Fully compliant with USB Spec. For Win-98/se/me , Win-2000 Win-NT up 5.0 Ver,Win-XP MAC OS. 8.6 up ,Linux AUM140-P Prolific Chip (No LED Indicate) AUM140-F FTDI Chip (With 3 LEDs Indicate) LED Indicate : Power, TX, RX (AUM140-F) USB1.1 & USB2.0 compatible USB Cable ----- USB A / M +15cm cable RS-232 -- DB9 / M + cable * 4 Head cable length 1: 5cm 2. 15cm 3. 27cm 4. 39cm Housing : Molding Weight : 250g Length : Total 75cm