1.4 series(4/1A,4/2A,4/3A) Line Jack Unit 2.telephone box, telephone connector 3. ... ABS material 4.86x86x8.2mm 4 series(4/1A,4/2A ... Unit (telephone box, telephone connector)4/1A,Double Full Master4/2A,Double PABX Master4/3A,Double Secondary3u"~50u ... for choicesOME service available 4 series(4/1A,4/2A,4/3A) Line Jack Unit (telephone box ...