Check the listing for details. Double Sided PoE Clock, Network Time Server Synchronized, Automatic DST Reset. Condition: New. Listed at 275.00 USD. Clock FeaturesAutomatic Daylight Saving Time change (if applicable).Time is automatically set by Simple Network Time Protocol(SNTP)- no master clock or serial connection required.Uses PoE ( Power over Ethernet) for easy installation and operation.Adjustable brightness (brilliant, bright, normal, dim, off).Static IP or DHCP addressing.12 or 24 hour display.Capability to receive realtime countdown command.If connection to NTP server is lost the clocks will continue to run on the built-in time base. When the connection is restored it will synchronize automatically.The clock features time loss notification by having a light on on the right lower corner.Optional FunctionsBuilt-in bell relay. We can add a built-in bell relay to the clock, then it can be connected to a bell and the bell can be programmed to ring at 30 different moments using the management software.Temperature and humidity display. We can add a temperature sensor or humiture sensor to the clock, then it can display time, temperature and/ or humiture altenately.Purchase Links of Optional FunctionsBuilt-in bell relay: Optional Built-in Bell Relay Upgrades for GlobalTime NTP Clocks | eBayTemperature sensor: Optional Humidity and Temperature Sensor Upgrades for GlobalTime NTP Clocks | eBayHumiture sensor: Optional Humidity and Temperature Sensor Upgrades for GlobalTime NTP Clocks | eBayNotes (1) The management software only supports Windows system, doesn't support Mac.(2) We will send you the data sheet and manual by email. Please check your email after placing orders.(3) The clocks can use PoE or power adapters for power supply. If you need power adapters, please leave a note when placing orders, or we won't include the power adapters in the packages. Please specify which type of mounting kit do you need when placing orders.