Works with Alexa for voice control (Alexa device sold separately).Add on Camera only - Base Station RequiredPatented 100% Wire-Free design for easy placement anywhereNight vision cameras work even in the darkMotion activated cameras w/ email or Arlo app notifications- Records and alerts only when motion is detected with 7 days of free rolling cloud storageIndoor/ outdoor Weather-resistant cameras. Operating temperature: 32° to 122° F (0° to 50° C)Add on Cameras only - Base Station RequiredArlo Smart adds powerful intelligence to your Arlo cameras. Customize alerts to detect people, specific zones, and contact emergency responders right from your smartphone's lock screen (optional service, includes 1-month trial)Add on Cameras only - Base Station RequiredDoes not have audio function