TuneRCbuzzer v2 has a driver circuit built in, so you can connect it to any flight controllers as long as there’s a free/available port on it.

V2 features a plug design and longer wires for better maintenance.

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How to Connect the Buzzer to Flight Controllers that features Buzzer+ Buzzer- Soldering Pads?

You just need to wire the buzzer with the flight controller as per the instruction below. And you dont need to do the mapping in Betaflight.
FC Buzzer+ Buzzer Red Wire (3V-5V)
FC GND Buzzer Black Wire (GND)
FC Buzzer- BuzzerWhite Wire (Signal)

How to Connect the Buzzer to EZ F411 AIO and Other Flight Controllers that dont Feature Buzzer Pads

Step 1. Firstly, please solder the buzzers signal wire ( blue wire) to any available/free port on the flight controller.
For example, RX1 is mostly the available port on the EZ AIO, so you can connect the
FC RX1 with the Buzzer Signal Wire (White Wire),FC 5VBuzzer 3V-5V (Red Wire),FC GNDBuzzer GND (Black Wire)

Step 2. In Betaflight, Enter resource in the CLI to find out the pin number corresponding to the port.
For example, pin number on the EZ corresponding to RX1 is A10.

Step3 . Free the available port in the CLI and then set the corresponding pin as beeper, finally enter save in the CLI
For example, on the EZ AIO board, in the CLI, enter resource serial_RX 1 NONE , and then enter resource beeper 1 A10. Finally enter save and you are done.

Specifications:

• Working Voltage: 3-5V
• Sound Loudness: 80db@3V, 85db@5V
• Length: V1: 10.5mm | V2: 10.5mm
• Height: V1: 7.5mm | V2: 10.5mm
• Weight: V1: 1.4g (including 75mm length wire) | V2: 2.0g ( including 0.9g 200mm length wire)
• Wire Length: V1: 75mm | V2: 200mm
• White wire (V2): for signal
• Red wire: for 3V-5V
• Black wire: for GND

Package includes:

• 1x TUNERC Buzzer V2 with Built-in Driver Circuit