4K-1 - Videx 1 station Audio Kit -Flush

The basic 1 way audio kit comprises of:
1 x flush mount door panel and backbox  with call button and nameplate (Dimensions: W 160mm x x H 135mm x D 16mm + 45mm backbox )
1 x 321 psu ( or 322 for larger kits) 
1 x 3011 wall mount handset with electronic call tone and door release facility. (Dimensions: W 85mm x H 218mm x D 55mm)

Larger kits are available - will have appropriate number of call buttons and matching number of handsets with a suitable psu.