The TV was a 3 - inch ( 7.6 cm ) black - and - white cathode ray tube .
In 1975 , JVC introduced the first combined portable battery - operated radio with inbuilt TV , as the model 3050 .
The TV was a 3 - inch ( 7.6 cm ) black - and - white TV     .
In 1975 , JVC introduced the first combined portable battery - operated radio with inbuilt TV , as the model 3050 .