The AR51A-07 from AccuBeat is a Time and Frequency Standard with Frequency 10 MHz, Frequency Stability ±0.3 ppb, Output Power 8 dBm, Phase Noise -153 to -96 dBc /Hz, Short Term Stability 0.04 to 0.04 ppb. Tags: Time & Frequency Standard. More details for AR51A-07 can be seen below.