With group setting and family sharing function, this switch is a useful smart home device. You can switch the lights on and off anytime, anywhere with this switch controlled by voice, to release your hands and save electric power. This switch is constructed of pc material. The length is 3.92cm and width is 3.92cm. The switch is suitable for home, office, hotel, etc. Item Name: Smart Switch Material: PC Features: Remote Control, Voice-control, Group Setting 1 Gang: One-opening Double Control 2 Gang: Two-opening Double Control 3 Gang: Three-opening Double Control 4 Gang: Four-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: LED 250W 10A 2 Gang: LED 2x150W 2x5A 3 Gang: LED 3x150W 3x3.3A 4 Gang: LED 4x150W 4x2.5A 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 Smart Switch 1 x User Manual