Z-Wave Smart Energy Meter - 9.99....Really?

Yup. Look at the manual for the one you purchased. You’ll see that is has a USB plug and adapter. The newer ones don’t. Also, the one you purchased has room for 4 AA batteries. They can act as a backup, or be run with just batteries (I don’t recommend that).

If you like, here’s a DH I put together from others in the Community:


Here’s more info as well: