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The EM3587 from Silicon Labs is a RF Module with Frequency 2.4 GHz, Supply Voltage 2.1 to 3.6 V, Output Power -55 to 8 dBm, Sensitivity -102 to -94 dBm, Data Rate Up to 5 Mbps. More details for EM3587 can be seen below.
Compact and Powerful Bluetooth Smart SoC
2.4 GHz Random Phase Multiple Access (RPMA) Module
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