Viking Weather Resistant Exterior Door with Installation Kit - Stormproof Entry Door for Homes & Commercial Buildings

New high output speaker amplifier with volume adjustment POT Microphone volume adjustment POT 24V talk battery 20Hz ring generator (3.0 REN ring load maxiumum) Selectable number of rings (2, 3, 10, or 30) Extended operating temperature range: -15 degrees F to 130 degrees F Compact 45 degree terminal strip for easy wiring Optional Enhanced Weather Protection (VK-W-2000A-EWP)