Using touch sensor button, which is generous and nice-looking, also can save electricity Rainproof cover design, waterproof and moistureproof, which can protect the service life of the machine Unlocking function (the unlocking interface is suitable for DC 12V normally open/normally locked lock) The doorbell is equipped with a exit button interface, it is practical. An outdoor machine can support up to 5 mobile phone users The doorbell can talk with cell phone, which has clear and loud sound quality Recording function, you can use mobile phone to check it at any time Adds a variety of ways to unlock, such as card, password and face recognition unlock P2P servers push visitor's calls, take photos of visitors and detect alarm records Specification: Switching Power Supply: AC 110-240V Machine Current: Less Than 800mA Call Delay Time: 120s10% Camera Sensor: AHD 720P Lens: 3.6mm, 92 Degrees Function: Unlock, intercom with cell phone, face recognition, infrared night vision,take photo, video recording, etc. Equipment Requirements: 1. Smartphone or tablet for Android 4.1 or above and for IOS operating system 2. Household network above 4M 3. Mobile network 3G, 4G Note: Does not include memory card, no battery, not rechargeable, needs to be connected to power source. Package included: 1 x Indoor Monitor 1 x Outdoor Camera 2 x Power Adapter 1 x 4-core Terminal Wire (5m) 1 x Unlock Terminal Wire 1 x Mounting Plate 1 x Screw 5 x ID Card 1 x Remote Control 1 x English User Manual