This module is composed of a GPS module and an OCXO module. The GPS module is used to provide and GPS messages. The OCXO module is used to provide a 10Mhz high-precision clock of 0.01PPM. Suitable for the-original B210 and B200, the function is the same as GPSDO, but it is not a real GPSDO. Compared to GPSDO, the advantage is that it can provide a high-precision 0.01PPM10Mhz reference clock without GPS signal. If there is no GPS signal, the clock accuracy of general GPSDO is generally only 0.5PPM. This is more suitable for indoor development. If pulses are needed to achieve synchronization, GPS signals are required. Made of high-quality materials. Name:GPSDO OCXO Module Applicable:for USRP B210 B210 SDR The product appearance and printed words depending on the batch, but this does not affect use. Colour:Green Material:PCB Package Contents: 1 * GPSDO OCXO Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.