This 2-Channel 30-Amp Time Relay is equipped with firmware built into the board that will allow you to setup a time schedule to trigger relays. The Time Relay series has an integrated battery backed Real Time Clock with memory to control relays based on a time schedule (the board knows what day & time it is). Use your computer to setup the time schedule and store your schedule into the controller. Once stored, the Time Relay board does not require a computer, and will activate relays according to a schedule that can be as simple or as complex as your application requires. The Time Relay Controllers are configured using a computer using a direct USB connection. Once configured, a controller will operate without a computer. At any time, a computer may monitor the Device, Activate Relays, or Change Configuration settings. A computer can take over a time schedule or a controller can operate without a computer. The Configuration Utility provides 1000 user configurable events where a relay or group of relays can be turned on or off. It's that easy! Once a Time Schedule is configured it will run through the list of events stored in its on board memory every second to look for a match with the current time. If a match with the current time and a configured event is discovered it will execute the event. Events are scheduled times when a relay or group of relays are turned on or off. They are defined by the user first by time: Year, Month, Day of Month, Day of week, Hour, Minute, and Second. By having these options you have the ability of switching relays on or off at very specific times. They are also defined by how they control the relays, whether they turn a relay or group of re-lays on or off. You can add up to 999 Events to the list. Relays do NOT provide a voltage output. They provide a contact closure output, exactly like the terminals found on a light switch at your local hardware store.