You can control this switch remotely by voice and APP, and it has timing and countdown functions that will facilitate your life. With easy installation and dual circuit management, this switch allows direct attachment to the in-line box without the need to modify the wiring. This switch module is constructed of pc material. The length is 3.92cm and width is 3.92cm. The switch module is suitable for home, office, hotel, etc. Item Name: Switch Module Material: PC Features: Power-off Memory, Voice-control, Group Setting 1 Gang: One-opening Double Control 2 Gang: Two-opening Double Control 3 Gang: Three-opening Double Control Voltage: AC100-240V 50/60Hz Working Temperature: -10 Degrees Celsius to +45 Degrees Celsius Working Range: Less Than 100m IP Rating: IP20 Maximum Load: 1 Gang: 10-100W 2 Gang: 2x(10-100W) 3 Gang: 3x(10-100W) Functions: Support Two-way Control, App Remote Control, Voice Control, Timer Schedule, Relay Status Setting, Group Control, Smart Scene 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 Switch Module 1 x User Manual