Do you have a desktop PC, or probably an older laptop system that haven’t got the Wireless 802.11 n treatment? If so, D-Link USB Wireless N Module will be useful for you.
Wireless N connection has been available on most modern laptop or tablet device. Even gaming console has this stuff installed by default. It’s pretty much a common feature that any wireless capable gadget will have but D-Link think that not everyone is capable of enjoying this technology yet. That’s why they’ve launch a mini sized USB wireless N Modules codenamed as DWA-121 Wireless N 150 Pico USB Adapter and DWA-131 Wireless N Nano USB Adapter.
The shape is just like any wireless dongle that you can find for a wireless mouse, or a pico bluetooth dongle. These USB wireless N Modules support up to 300Mbps transfer speed, WPA/WPA2 encryption and wireless connection manager. They are available now for $49.99 with Windows OS as the native support. No idea if you can use it on your iMac or Macbook, but is that really necessary?