The XBFTR from Xtal Ball is a Time and Frequency Standard with Frequency 10 MHz, Frequency Stability ±0.3 ppm, Stability over Temperature 0.3 to 0.5 ppb, Phase Noise -168 to -105 dBc/Hz, DC Supply 5 V. Tags: Drop-In, Time & Frequency Standard. More details for XBFTR can be seen below.