* 4.5-inch HD screen for APP-based visual intercom
* Fast recognition within 0.3s, supports up to 250 users
* Sturdy space aluminum construction with CNC precision carving
* WiFi connected, rechargeable lithium battery, fits 1.6-4.7 inch doors
* Multiple unlock options(fingerprint / passcode / card / mechanical key / one-time password / remote unlock), optional palm print recognition included