Three types of display clocks are available depending on your application. All utilize a NetClock network time server as the system's master clock. IP clocks synchronize directly via network time protocol (ntp) over ethernet. Clocks can be powered by power-over-ethernet, or 110/220VAC. Wireless clocks are synchronized through a network-based 900 MHz transmitter. Every clock is also a wireless repeater for an extremely reliable wireless mesh network. TimeView® clocks synchronize by 2-wire RS-485 or through an existing UHF voice radio system.