does the cell $150 annual rate include monitoring

No it does not, it just covers the cost of operating the cellular device. The monitoring plan is found here: https://www.alarmsystemstore.com/products/alarm-monitoring

does alarm.com monitor dual path communicator?

Yes, and all of the current alarm.com communicators are dual path. This product you are asking this question on however has nothing to do with Alarm.com. Connect24 is only for use with certain DSC branded communcators that are not alarm.com compatible. See here for the alarm.com communicators: https://www.alarmsystemstore.com/collections/alarm-com-communicators

Connect 24 Cellular Communicator Monitoring Add-On

$150.00

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Connect 24 Cellular Monitoring Add-On

If you wish to have your alarm system monitored via a Connect 24 cell communicator, you will need to purchase this service.

We generally only recommend C24 service for customers that already have communicators that require C24. We recommend and endorse alarm.com or Alula for cellular / dual path services whenever possible because of the lower cost and additional features these providers offer.

Service fee is for one year of cellular / dual path signal forwarding service to our central station partner. Service will renew automatically annually thereafter until you cancel. Service fee is for transmission of alarms and trouble conditions and does not apply to open / close reporting for commercial accounts.

QUESTIONS & ANSWERS

does the cell $150 annual rate include monitoring

No it does not, it just covers the cost of operating the cellular device. The monitoring plan is found here: https://www.alarmsystemstore.com/products/alarm-monitoring
does alarm.com monitor dual path communicator?

Yes, and all of the current alarm.com communicators are dual path.

This product you are asking this question on however has nothing to do with Alarm.com. Connect24 is only for use with certain DSC branded communcators that are not alarm.com compatible. See here for the alarm.com communicators:
https://www.alarmsystemstore.com/collections/alarm-com-communicators