App Support: Free iOS and for mobile App eWeLink; control: Control each gang separately in APP eWeLink.Sync Status: Real-time device status provided to App.; Remote ON/OFF: Turn 4 electrical devices on/off remotely from anywhere.3 Working Modes: Switch among interlock/self-locking/inching modes. Supports remotely turn on or off connected appliances, for example light, electric kettle, electric rice cooker, electric curtain, etc.Timing: Supports 8 enabled countdown/single/repeat timing tasks to turn on/off at specified time. DIN Rail Mounted: Great for industrial control.Voice Control: Compatible perfectly with , for Google Home, for ,IFTTT; Share Control: Control your together with your family.Operating Temperature(recommended): -20-70CelsiusOperating Humidity: 5%-90%RH, Non-condensingWireless Standard: 2.4GHz, 802.11 b/gSecurity Mechanism: WPA-PSK/WPA2-PSKProduct Size: Approx. 112 x 83 x 26 (mm) Supply: 85V-250V+RFcolour:WhiteMaterial:plasticPackage Contents:1 x 4CH Smart Wifi SwitchOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.