Home » Spares Alpha Amplifer – 25001 Alpha Door Entry Systems Speech Unit (AC/DC)Alpha Audio & Visual Systems Terminals : 3 1 2 AC1 AC2 V £49.00 + £12.00 Carriage Alpha Handset – 26002 Alpha Audio Door Entry Handset Alpha electronic call tone No AC buzzer Terminal markings : 1 2 3 5 V £39.00 + £12.00 Carriage Alpha Vandal Button – 30003 Alpha Audio Door Entry Button Stainless Steel Vandal Resistant (Dim’s: 19mm Dia x 28mm) £13.00 + £9.00 Carriage