This device can help you send and receive data wirelessly from one Arduino to another one which is using a similar setup. Unlike other (more expensive) modules, this one does NOT have WiFi capabilities, which means you cannot connect to a wireless network (router) and communicate via TCP/IP. If you are looking for that, you need a Wi-Fi Arduino module, which is also working on the 2.4GHz frequency, and is also available on DX.
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