- Compact size: Front panel is the size of a typical single gang midsize wall plate- Mounting: Flush mounts in a single gang electrical box (2.25" deep x 2.00" wide x 2.84" tall minimum) or surface mounts in a viking model VE-3x5 (not included)- Available in 5 standard faceplate finishes: Brushed Stainless Steel Oil Rubbed Bronze Polished Brass Satin Black and Satin White- PNL-40 faceplates: Replacement faceplates with matching screws available in all five standard finishes- Vandal resistant features: 16 gauge polished brass or 18 gauge 304 stainless steel faceplate 316 stainless steel push button carbon fiber reinforced plastic speaker screen scratch resistant powder coating hex drive mounting screws- Weather resistant features: Mylar speaker faceplate gasket mic and speaker gasket internally sealed push button switch self draining mic mount and UV stable weather resistant powder coating (excluding E-40-SS 304 Stainless Steel Faceplate)- Telephone line powered- Microphone and speaker volume controls- Programmable intelligent call progress detection for automatic hang-up on CPC silence busy signal or time out- Selectable auto answer feature for monitoring- Programmable VOX (mic/speaker) switching speed- Blue LED helps locate push button indicate ringing and off hook