Alexa Drop In is an optional feature that allows you to connect instantly to supported Alexa-enabled devices, like an intercom. You can use Drop In to open an instant conversation between your devices or with your Alexa contacts. When you receive a Drop In, the light indicator on your Echo pulses green and you connect to your contact automatically. You can use Drop In to:

• Have a two-way conversation by connecting to one of your Alexa-enabled devices ("drop in on Kitchen").
• Connect to a specific device group ("drop in on living room"). Note: Only one Alexa-enabled device from the device group connects.
• Have a group conversation with all supported Alexa-enabled devices under your Amazon household, which are not set to do not disturb. To start a group conversation, ask Alexa to "Drop In everywhere". Note: All supported Alexa-enabled devices under your Amazon household account will connect regardless of their physical location.
• Drop In on a contact who granted you Drop In permissions.
• Receive Drop In from a contact whom you granted Drop In permissions.

Dropping in with Alexa is more about connecting and sharing spaces than hopping on a call. It works best when the experience is more ambient than attentive. You can also use Drop In as a two-way intercom. To use Drop In, you need to sign up for Alexa Calling and Messaging. Once you sign up, you can enable Drop In by default, but you still need to switch on the feature for specific speakers and contacts. You can drop in on your Echo devices by saying "Alexa, Drop In on Home" or by selecting the device from the Communication screen in the Alexa app.