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The CC2531 from Texas Instruments is a RF Module with Frequency 2.4 GHz, Supply Voltage 2 to 3.6 V, Output Power 4.5 dBm, Sensitivity -97 dBm, Data Rate 250 Kbps. More details for CC2531 can be seen below.
Compact and Powerful Bluetooth Smart SoC
2.4 GHz Random Phase Multiple Access (RPMA) Module
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