3-In-1 Triple Security: Combines Smart Lock's quick fingerprint recognition, HD camera, and advanced video doorbell notifications in one device. 5 EASY WAYS TO UNLOCK: The advanced chip and ultra-thin fingerprint film recognize you in 0.3 seconds, and unlock your door in 1 second. You can also control Smart Lock from the eufy Security app , by speaking to Alexa or the Google Voice Assistant, or by using your keyboard or keys. Remote Control From Anywhere: Wherever you are, you can see who's at your front door and control your lock with the eufy Security app. It caches thumbnails in the cloud. One big battery that covers it all: the fully rechargeable battery. The large capacity of 10,000mAh means you never have to worry about Smart Lock running out of power. Security and Durability: Protect your privacy and never pay a subscription fee with Chime's built-in local storage. BHMA certified after being locked and unlocked over 200,000 times. IP65 waterproof, working temperature (-30°C to 70°C).