Control your thermostat using any touchtone telephone;Calls up to 4 phone numbers to notify of abnormal conditions;24 hour battery backup in event of power failure;Dimensions: 2.1 x 7.8 x 8.8;Battery: Uses 6 C alkaline batteries (not included), providing up to 24 hours of back-up time

• Sensaphone 400 Monitoring System, 4-Channel (FGD-0400)

Sensaphone 400 Monitoring System, 4-Channel (FGD-0400)Phonetics, Inc.