Contact Sensor for Home Security WiFi Door Sensor: Smart Door Open/Close Detector Tuya Door Sensor: An upgraded door sensor with Bluetooth and dual Wi-Fi connectivity, no hub required; no additional charge. Easily set up a Wi-Fi window alarm for your home in minutes, controlled from your phone via Smart Life and the Tuya app. Compatible with Android and iOS systems. The included 3M sticker makes it easy to mount the door sensor anywhere, ensuring it's durable and secure. Mobile Alert: Receive mobile notifications when the door is opened or closed, and the status change is recorded in the history log. Window alarm sensors can be used on doors, windows, and closets. </span></li> <li class="a-spacing-mini"><span class="a-list-item">Voice Control: The Wi-Fi garage door sensor is compatible with Amazon Alexa and Google Assistant. You can use your voice to check the open and close status of doors and windows. </span></li> <li class="a-spacing-mini"><span class="a-list-item">Home Automation: The access control alarm sensor works with Tuya Smart/Smart Life/Alexa and automation programs. You can create programs/scenes in Alexa or the Smart Life/Tuya Smart app to operate other smart devices (smart bulbs, smart sockets, sirens, etc.). </span></li> </ul>