Does it need to be wired into the house?

No. The chime plugs in or runs on batteries and the button is wireless, so no doorbell wiring is needed. You only mount the button by the door.

How does the motion detection work?

The button or chime senses movement near the door and sounds an alert, so you hear someone approaching before they press. It is a basic motion alert, not a camera.

Can I add a second button or chime?

This is a single-button, single-chime kit. Adding more units depends on whether the model supports pairing extra accessories, so check the kit contents before buying for a second door.

Will it work through walls and a metal door?

Wireless doorbells usually reach across a typical home, but thick masonry and metal doors shorten range. Keep the chime within a reasonable distance of the button.

Is it a smart doorbell with phone alerts?

No. It chimes and gives a motion alert only. There is no camera, app, Wi-Fi or phone notification, which is why it is simpler than video doorbells.

What batteries does it take?

The button and chime use standard batteries, typically AA or AAA depending on the unit. Check the battery compartment before installing so you have spares.