Linortek Netbell-2 TCP/IP Ethernet 2 Zone Bell Ringer Web-based Bell Controller for 110V 10A Alarm Signal Bell/Horn/Buzzer and Other Timed Equipment POE Built-in web server with up to 500 web-based bell timers / event scheduling software for relay control, the Netbell-2 can be used to control up to 2 timed event devices (110V 10A) over the Internet Program and web page interface are upgradable over the Internet, no additional software or designated computer required Built-in real time clock synchronizing with NTP server every 10 minutes (user changeable), flexible and accurate control of when the bells ring (HH:MM:SS, SUNDAY-SATURDAY) Two line voltage relay outputs (1-Form-A relays 110/220 10A) for bell control, two digital inputs for adding external switch to ring bell manually in Netbell system, power supply and Internet cable included Compact and self-contained, supplied with the hardware and software you need to control your existing bell timer devices,use it out of its packaging, wire your bells with the controller, connect power and network with the provided cables, it's ready to go.