Line Jack Unit (telephone box,telephone connector) 2 series (2/1A,2/2A, ... Size:68x68x29mm 2 series (2/1A,2/2A,2/3A)Line Jack Unit (telephone box,telephone connector)2/1A,Single Full Master2/2A ... :68x68x29mmBack box size:68x68x21mmSTPA230 or 2R230 for choicesOME service available Line Jack Unit,telephone box