https://devzone.nordicsemi.com/f/nordic-q-a/2360/ibeacon-kit-can-work-at-internal-32-768khz-rcHi sir On your Beacon kit, we found it was used external 32.768KHz at 20ppm. Question is on iBeacon usage, is a external higher precision 32.768K crystal necessary ? Or customers can use the built-in RC one ? Thanksen-USTelligent Community 13Mon, 28 Apr 2014 14:05:27 GMThttps://devzone.nordicsemi.com/thread/9681?ContentTypeID=1Mon, 28 Apr 2014 14:05:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:69a867fa-eceb-4227-af0d-ef264a88dbd1run_ar<p>Hi,</p> <p>You can use the built in RC. The external crystal is there in case we would like to use the kit for something else as well ;)</p> <p>Best regards,</p><div style="clear:both;"></div>