The phrase "a speakerphone with a" is correct and usable in written English.
You can use it when describing a specific feature or capability of a speakerphone, often followed by what that feature is.
Example: "I need to buy a speakerphone with a noise-canceling feature for my home office."
Alternatives: "a speakerphone featuring a" or "a speakerphone equipped with a".
The Jambox claims 10 hours of sound from a rechargeable battery, and it works as a speakerphone with a built-in speaker for calls through a linked phone.
While on a speakerphone with a reporter for a recent interview, the N.B.A.'s deputy commissioner, Adam Silver, entered Stern's office.
We get one five-minute collect phone call on a speakerphone with a law right there every three months if we ain't caught no cases.
"You are on a speakerphone with at least 14 teachers and librarians and suchlike great, wise and good people, I thought.
The cereal line was started in early September, but the mistake did not come to light until this week when, according to the Cincinnati television station WCPO, a family called the number on a speakerphone with their 9-year-old daughter listening.
On July 30, according to an affidavit by Mr. Wong, he was contacted by Larry Smith, a deportation officer in Hartford, who told him on a speakerphone, with Mr. Ng present, that he wanted to resolve the case, either by deporting Mr. Ng, or "releasing him to the streets".
Back at the Hay-Adams, Hoft was having a conversation, on speakerphone, with a Gateway Pundit blogger.
Flynn was explaining this by speakerphone, with a Wal-Mart press officer listening in; she, too, conceded that the company had "a learning curve in all of this".
She offers up her lackadaisical, bitter self and chats by speakerphone with a Web site owner who has an unusual oral fixation: he is fascinated by famous mouths and has a fetish for dental hygiene.
And the Boombot Rex can hold up to adverse weather conditions, including mud and dust, and it doubles as a very capable Bluetooth speakerphone with a long-lasting battery.
Alig opened the door mid-call, talking on speakerphone with an unidentified male friend about who should be on the guestlist and which promoters to work with for that weekend's Peeew! event—" He doesn't bring anyone in!
