Check the listing for details. TekTone Apartment Intercom Amplifier (PK543A). Color: N/A, Condition: New. Listed at 161.00 USD. Power your TekTone Apartment Entry System with the TekTone Apartment Intercom Amplifier. This unit works as a power supply, control unit, and power amplifier designed to operate with 3-wire or 4-wire Apartment Speaker Stations (sold separately). Voice volume and audio tone volume controls are adjustable through the front facing screw terminal. The TekTone PK543A amplifier also includes multiple door release operation with three delayed door timing modes: AC, DC, or Maglock, and two call tones: steady or warbling.Power Supply/Control Unit/Amplifier for TekTone Apartment Entry Systems3 Door Timing Modes: AC, DC, or MaglockTwo Call Tones: Steady and WarblingSelectable Door Button Hold Timeout and Talk before Door Interlock NOTE: The TekTone PK543A is required for IRx03E or IRx04E TekTone Apartment Intercom Stations (sold separately).Technical DetailsManufacturer Part #: PK543AUPC: 812664020061Dimensions: 5.5 (H) x 3.125 (W) x 2 (D) inches (140 x 80 x 51 mm)Construction: Flame-retardant (UL 94V-0) plasticAmplification: Integrated circuit amplifier with frequency response, adjusted for ideal voice qualityCall Tone: Integrated circuit oscillator with steady and warble modesDoor Release: AC, DC or Maglock (12 VDC/24 VDC)Controls: Voice Volume, Tone Volume and dip switches for selectable modesConnections: Polarized plug-in typePower Required: 16 VAC, 10 VAMounting: Surface mount