Some flashers have a buzzing function.

Some flashers have a beeping function, which means that when you turn on the turn signal, the flasher emits a fixed-frequency beep. However, the beeping function has its pros and cons. The advantage is that when the turn signal is on, it beeps, reminding us cyclists to turn it off after making a turn, as it keeps beeping, serving as a reminder. The downside is that these flashers tend to be relatively fragile. I don't know if everyone has noticed, but many new bicycles now come with flashers that do not have a beeper.
Of course, flashers without a beeper also have their drawbacks; some people may turn on the turn signal after the vehicle has turned but still forget to turn it off, and this situation does happen.
So, there are pros and cons to both. Personally, I don't really like those flashers with sound prompts because they are too noisy. It depends on personal preference. Generally speaking, flashers without a beeper are more durable.
So, if I don't have a three-wire flasher, can I use a wireless flasher instead? Yes! Because the flasher mainly operates with two wires, one for power input and one for power output, while the other wire is non-functional and does not need to be connected. For example, our motorcycle has three wires: one black wire, one green wire, and one gray wire. We only need to connect the black wire and the gray wire. The black wire connects to the power input, the green wire connects to the power input, and the gray wire connects to the power input.