The ESE ES-160F-NTP6 is a crystal-based Master Clock / Time Code Generator with the NTP6 Option. NTP Time Server: Network Time Protocol Output with IPv6 & Network Control input via Ethernet (10/100Base-T, RJ-45). The unit employs a temperature compensated crystal oscillator (TCXO) which provides the ES-160F with an accuracy of one second per month. Six .56" yellow LED's display the real time or date while the unit simultaneously generates several types of time code. The unit provides a Coin Cell for time backup.