A good wireless headset buys you quiet in a noisy room and keeps your voice clear on daily calls. A well-built pair should easily last you three to four years of full-time work, so buying the right set once beats replacing a cheap, uncomfortable pair every twelve months.
Audio hardware moves on an annual cycle. When brands release their newest flagship model, last year's version usually drops down to about $280. You end up with nearly identical battery life, comfort, and noise canceling without paying the launch-day markup.
That 15-month intro period is a firm deadline, not free money. If you still owe money when the clock runs out, the card's regular variable APR kicks in on the remaining balance and erases what you saved on sale. Set up an autopay for $18.67 each month so the balance hits zero well before the deadline.