Through the application or voice, this switch can precisely control the percentage level of curtain opening. With timer, countdown and schedule functions, this switch allows you to customize the time when the curtains open and close. This switch is constructed of pc material. The length is 3.92cm and width is 3.92cm. The curtain switch is suitable for home, office, hotel, etc. Item Name: Curtain Switch Material: PC Features: Fast Pairing, Voice-control, Group Setting 1 Gang: One-opening Single Control 2 Gang: Two-opening Single Control Rated Voltage: 100-240V 50/60Hz Maximum Load: 1 Gang: 3A 2 Gang: 2x3A Working Temperature: -10 Degrees Celsius to 40 Degrees Celsius Working Range: Less Than 100m Protocol: WiFi IEEE 802.11b/G/N Size Details: LxW: 3.92cm x 3.92cm/1.54" x 1.54" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Curtain Switch 1 x User Manual