controls one work status, enable interlock to turn on 1 channel and turn off other channels simultaneously. [Automatically Turns Off] Don't want to stiffly fumble in the dark for the way? Enable inching mode to set a "on" schedule for your corridor light, and it will automatically turn off after reaching the preset time. [Voice Controls Your Home] Compatible with Alexa and Google Home. Wanna turn off the light immediately? Just tell it to do. [Easy to Out-of-Reach Devices] Mounted on the guide rail, convenient to connect and control devices far from the switch. [Safe to Use] The durable flame-retardant PC shell provides the maximum safety for connected devices in use. Note: 1. The device only works with 2.4GHz WiFi. 2. If the router is working in dual-band (2.4GHz & 5GHz), please upgrade the eWeLink app to V4.0.0 or above. 3. The Pairing will fail if a wrong WiFi password is input. 4. The device shall get close to router for a good transmission signal condition while pairing. 5. 433MHz RF Controller is not included. Specifications: Model: 4CH PRO R3 Material: PC V0 Voltage: 100-240V AC, 50/60Hz (DC: 9-23V) Max. Load: 10A/2200W/Gang, 40A/8800W/Total Wireless Frequency: WiFi 2.4GHz Wireless Standard: IEEE802.11 b/g/n, 2.4GHz (2400M-2483.5M) Security Mode: WPA/WPA2 Compatibility: Compatible with Android 4.1 or later, iOS 9.0 or later Wiring Way: N and Light Wire Diameter: 0.5-1.5mm (24-14AWG) Gang: 4 433MHz Remote Control: Yes Dry Contact: Yes AC Input: Yes DC Input: Yes 3-Month Operation Records: Yes Interlock Mode: App Inching Mode: App Item Size: 14.5*9*3.4cm / 5.7*3.54*1.33in Item Weight: 202g / 7.12oz Packing List: 1 * Smart Switch 1 * Screwdriver 1 * User Manual