yhml 720p smart home wifi video doorbell, 2.4g wireless videophone with rftd card, wireless unlock, motion detection wireless intercom doorbell yhml note: the electronic lock and the access controller are non-polar and the unlocking voltage is 12v. please check the specifications of the unlocked power supply separately. the power adapter or poe power supply used by the user is 12v / 1a if you do not need a connection lock.<br /><br />how to install wifi smart doorbell?<br />install in an armored position to avoid direct sunlight or rain. recommended installation height is 1.3~1.6m<br /><br />server: p2p cloudlink transmission, adaptive network<br />network: wifi 802.11 b / g / n or directly connected to the wired network<br />audio: g.711 a compression mode<br />call: 3 dvoice voice engine technology full duplex call<br />video format: h.264<br />recording mode: manual recording, alarm recording, timer recording<br />external memory: micro sd card, up to 128 gb<br />camera: 1megapixels<br />camera lens: 2.5mm, 110 degree wide angle<br />night vision: infrared cutting without color difference, night vision black and white within 5 meters<br />frame rate: 25 hd images (1280 * 720), sd (640 * 480), ld (320 * 240)<br />alarm: motion detection, pir detection, tamper alarm<br />push: send a message to your smartphone and send the image to your email settings<br />data interface: tcp / ip, udp, smtp, dhcp, upnp, onvif connected to nvr<br />ac adapter: dc9~16 v 1a or poe power supply via poe injector connector<br />waterproof rating: ip44<br />temperature / humidity: -20~55 °c 10-95%hr<br />weight: 750 grams