IR210: Motherboard IrDA adapter, connect to infrared pins on mainboard IR220: RS-232 serial port IrDA adapter, it also can be used in raw-IR mode. IR650: USB SIR(115.2kbps) adapter, most suitable for infrared mobile phone users. IR660: mini USB SIR(115.2kbps) adapter, most suitable for infrared mobile phone users. IR750: USB FIR(4Mbps) adapter, using Sigmatel Stir4200s as the main chipset. IR770: Mini USB FIR(4Mbps) adapter, using Sigmatel Stir4200s as the main chipset IR780: Mini USB VFIR(16Mbps) adapter, using Sigmatel Stir4220 as the main chipset