https://devzone.nordicsemi.com/f/nordic-q-a/81031/250k-mode-esb-of-51822Hi Nordic, From some cases in the devzone, I know for nRF52 series, the ESB doesn&#39;t support 250Kbps mode. One of my customer employ nRF51822 in their product, so I want to know: 1、Does nRF51 series support ESB of 250Kbps? 2、For BLE，the long rangeen-USTelligent Community 13Mon, 25 Oct 2021 13:40:52 GMThttps://devzone.nordicsemi.com/thread/335780?ContentTypeID=1Mon, 25 Oct 2021 13:40:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fb694aab-442b-4d86-b005-a65719f19744run_ar<p>1. nRF51 seems to be supporting the 250 Kbps bitrate. See the <a href="https://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf?cp=5_2_0#%5B%7B%22num%22%3A916%2C%22gen%22%3A0%7D%2C%7B%22name%22%3A%22XYZ%22%7D%2C56.692%2C518.154%2Cnull%5D">mode </a>register. I didn&#39;t check the ESB library though.</p> <p>2. Yes, it should give a small range improvement. But that depends on the surroundings. In a straight line outdoors you will probably get a small range improvement. But inside a building there are more &quot;hard&quot; barriers that will stop the signal, so you might not see any difference.</p><div style="clear:both;"></div>