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 | eBay About Unnecessary AccessoriesThe clock can use PoE or DC for power supply. So a power adapter is not necessary if PoE switch is available.On the back of the clock, there are two holes for hanging them on the wall, and we will include nails into the packages. So mounting kits are not necessary.However, if you need power adapters or mounting kits, please leave a note when placing orders, or we won’t send them. NotesThe management software only supports Windows system, doesn’t support Mac.We will send you the data sheet and manual by email. Please check your email after placing orders.