W200A with EWP - Viking door answering device - Answer your door from the safety of your telephone! - New high output speaker amplifier with volume adjustment POT - Microphone volume adjustment POT - 24 volt talk battery - 20 Hz ring generator (3.0 REN ring load maximum) - Selectable number of rings (2, 3, 10 or 30) - Extended operating temperature range: -15 degreesF to 130 degreesF - Compact 45 degrees terminal strip for easy wiring - Enhanced Weather Protection - One year manufacturer's warranty - Made in the USA VKW2000AEWP