Audio only handset for Simplebus cabling with volume control, privacy of speech, call tone privacy, door open push button and supplementary push button for porter switchboard calls. Complete with dip-switch with 8 positions for selection of the desired user code. There are a total of 6 additional programmable buttons for various functions such as turning lights on and opening gates. The handset is designed for audio only and video systems. Dimensions: 95X215X58mm.