Overview: This alarm system contains an alarm host(with doorbell function), a doorbell button, a PIR sensor, a door sensor. Support Tuya APP remote control. It's compatible with Amazon Alexa, Google Assistant for voice control. You can arm / disarm this alarm system via phone. When the thief came in, the door sensor or PIR motion sensor is triggered, the alarm host will make auto-dial or send APP notification to remind you, so that it can help you reduce property loss and guarantee your home security. With doorbell function, you will never miss an important visitors. Features: * Optional 58 Rinatones bring you colorful & smater life. Choose your favorite ringtone based on your personal preference, making it your intimate friend. * When a visitor presses the doorbell, loud sound is activated with "Tuya" APP notification to remind you to open the door. You will never miss a visitor. * Tuya APP remote control, and compatible with Amazon Alexa, Google Assistant for voice control. * Add 433Mhz door/PIR motion/smoke sensors to your doorbell alarm system, it will ptrotect your home security. *APP notification from connected detecting sensor online guarding your home at anytime anywhere. *Support 5 groups preset alarm phone numbers, SMS on / off and dial on / off can be set respectively for each phone number. * Anti-pet PIR sensor with anti-pet recognition technology, is under 15kg small pet immune, prevent false alarm when pet passing. *11 language switching freely: Chinese, English, German, Russian, Spain, Poland, Italy, French, Portugal, Greece, Romania * Indoor alarm host doorbell hub is plug and play, no need batteries, low power consumption. Outdoor doorbell button with anti-tamper alarm function. *Support 5 kinds of wireless defense zones mode, can be set as doorbell mode. *Support phone remote arm / disarm / intercom / monitoring function. *Low battery reminder from connected detection sensors. *Can record 20 seconds alarm voice. *Support SMS remote setting. Hub Specifications: Power Supply: 110/220V AC Backup Battery: 3.7V, 300mAh Lithium Battery (included) Consumption: