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[i]433 Mhz ASK/OOK: Most 433 Mhz devices use ASK/OOK modulation. You need to fit a 433 Mhz transceiver or both a receiver and transmitter module to work with these signals. 868 Mhz ASK/OOK: Only a limited number of devices like some weather stations use ASK/OOK modulation. You need to fit a 868 Mhz transceiver or both a receiver and transmitter module to work with these signals. 868 Mhz FSK: On 868 Mhz FSK, devices use different speeds to communicate to each other. It is more difficult to receive all these devices at once. We are currently implementing support for the CC1101 868 Mhz transceiver. 2.4 Ghz: Unfortunately various communication methods and modulation types are used. Devices with a different modulation and a different communication language can not talk to each other. Simplified, Wifi can not talk to Bluetooth etc. Besides that, while 2.4Ghz is the generic term, there are also many different "channels" making the frequency actually somewhere between 2.402 and 2.480 Ghz. RFlink supports various transceiver modules like the NRF24L01 and the CC2500 to talk to your devices. You only need to fit the module that matches the devices you want to communicate with. [/i]