Atomic clock class stability GNSSDO 24-hour holdover performance comparable to Rubidium.

GF-88 series is a full-featured multi-GNSS disciplined oscillator (GNSSDO), embedded with multi-GNSS receiver, OCXO, LDO regulator and antenna detection circuit in a compact pin-header module.
It provides outputs of one-second pulse, synchronized with Coordinated Universal Time (UTC) and reference frequency (10MHz) signal.

GF-8805, equipped with a high quality OCXO, has a frequency stability equivalent to that of an atomic oscillator of 1.5 μs / 24 hours, not only during reception of GNSS signals, but also during holdover when GNSS falls into unlock. Another module called GF-8804 shares the same form factor with excellent cost performance.
It is recommended either model based on designers request could save significant time and effort during product design.