Type B surface mounted stainless steel hands free unit. Also available in a Green Photo luminescent front panel, Braille identification, Vandal resistant, Induction loop, and Tactile text. Flush unit has a galvanised steel back box. A call is made by pressing the large momentary push button. This will illuminate the panel mounted ‘call registered’ red led, and initiate a conventional telephone call tone from the panel loudspeaker.