Specifics: Input voltage: DC4.5V LR03 * 3 (battery is not included in the factory) Static current: 30 A Low power voltage: 2.7V WiFi802.11b/g/n 2.4GHz Working temperature: - 10 ~55 Operating humidity: 10%~90% RH Size: 70 * 70 * 30mm Feature: 100% new with high quality Mini portable, easy to install. Wi Fi temperature and humidity sensor. Remote control: You can use the application, tuyasmart or smart life to remotely view the temperature and humidity through your smartphone. Third party voice control, in cooperation with Amazon alexa, a Google assistant. WIFI link and indoor temperature sensor make life more convenient. Friendly Tips Due to manual measurement , there may be 1-3cm deviation exist,hope you can understand. There are slight difference between the picture and the real item caused by light brightness,hope you can understand. Package includes: 1pc of Humidifier 1pc of Instructions