Ring's Protect Plus plan goes for $10 per month and doesn't require a contract. Monitoring for professionally installed systems tends to be more expensive. The ADT Pulse monitoring service starts at $28. 99 per month and requires a three
year contract, but you also have to figure in the cost of things like hardware components, cellular backup, and installation. When we reviewed the Pulse system, our upfront cost was more than $3,000, with a monthly fee of over $60. Some vendors, such as LifeShield, will let you buy the components outright
or lease them.