That's Freddy Boom Boom Cannon.
http://www.top40db.net/Lyrics/?SongID=61252&By=Year&Match=
She's my transistor sister
With a radio on her arm
No one can resist her
Cause she's loaded with
A musical charm
It's Presley, Darin, and U.S.Bonds
And it's Fats and Connie and Orbison
She's my transistor sister
Playing her radio
Yeah, now early in
The morning til late at night
She's in tune with the local D.J.s
Sings all the words to the latest hits
Right along with the records they play
Whoa, oh, transistor sister
Transistor sister
Transistor sister
Playing her radio, whoa, oh
She's my transistor sister
Boy, you've got to love her a lot
The guys just can't resist her
With a fifteen thousand watt
If you got it right you get no static
The time and weather is automatic
My transistor sister, playing her radio
Yeah, now early in
The morning til late at night
She's in tune with the local D.J.s
Sings all the words to the latest hits
***
I liked this song when it was a hit in July 1961, not because I had a sister, but I could relate because I listened to all of this music while my older brother listened on HIS transistor radio.
The chorus is cool because he'd sing: Trans-sis-sistor, playing her ra-dee-O!