You have to upgrade your subscription plan to add Baby Monitor

[BobZillaRlo]

If you purchased a Arlo 5 pack Camera System and want to add an Arlo Baby monitor. You have to upgrade your subcription plan and pay a monthly service fee.

In my opinion, you should be able to buy the Arlo Baby monitor and add it to your current plan without additional cost.

[TomMac]

5 cameras are free, after that a paid or higher service is required

[Swiggles]

Use a second email address for the baby monitor and then share it with your email address for the base. 😉