Thermomètre-hygromètre multifonctionnel transfrontalier pour la maison, adapté aux étudiants, électronique

This product requires two AA batteries for power supply. The order does not include batteries. If you need batteries, you can contact customer service or choose the specification with batteries. Thank you! The battery-powered screen is in voice control mode, and the screen backlight cannot be always on.Use a USB power cable for constant screen brightness; USB cable not included but you can choose to order with cable specifications. Thank you. Note: Please do not use alkaline batteries such as Nanfu, Duracell, or 555.Excessive power from alkaline batteries can damage the motor!!!Please use a model of carbon batteries, such as Double Eagle and Huatai brands. Do not use Nanfu!! Do not use Nanfu! !