Let's Break Down The Description:

Operating VoltageThis buzzer requires a 5V direct current (DC) power supply. It's crucial to provide the correct voltage to avoid damaging the buzzer or experiencing suboptimal performance.

30mm Diameter The 30mm diameter indicates the physical size of the buzzer, specifically the diameter of the housing or diaphragm. A 30mm buzzer is relatively larger and can produce louder sounds compared to smaller counterparts. As for being a "wired" buzzer, it means that the buzzer has wires attached to it for electrical connections. Typically, these wires are used to connect the buzzer to a power source and a control circuit.

Voltage Compatibility Ensure that the power supply voltage matches the buzzer's operating voltage (5V). Using a higher voltage can damage the buzzer.

Wiring Connect the wires from the buzzer to your power source and control circuit. Ensure proper polarity (positive and negative) connection to avoid reverse polarity damage.