We are doing online marketing and we have a campaign for a smartphone where we say
“If we send you one, will you review it for us?”
Using “one” fits this case perfectly as “smartphone” is singular.
Let’s imagine we need to come up with a similar phrase for “headphones” or “earbuds”. How would this sound if these were “headphones/earbuds” instead of smartphones?
I agree with Marc, ‘a pair of earbuds’ or ‘a pair of headphones’ is a good choice. Another alternative would be ‘a set of headphones’. Let’s see what @Alan and @Andrea say…
@Pilsen, welcome to our forum. Out of interest, are you from Pilsen or is Pilsen your first name?
Yes, a ‘set of’, I just wanted to indicate that headphones and earbuds are plural since you don’t listen through one headphone or earbud. You use a pair of binoculars, because you have to use both eyes to get a closer look at something in the distance. I prefer a ‘set of’ like Torsten said.