1VOICE AND REMOTE CONTROL: With the for eWeLink app on for Android and for iOS, you can open or close electronic devices from anywhere with internet access. This WiFi switch also works with for Google Assistant for voice control of household appliances. It supports BT for close range control when the network is down. 2MULTIPLE OPERATING MODES: Choose from 3 modes, momentary, self locking, and interlocking. The adjustable momentary time ranges from 0.5 seconds to 1 hour, making it suitable for DIY garage door openers and other appliances. Different operating modes can be set for each channel in the app. 3EASY SHARING FUNCTIONALITY: Share control with other for eWeLink accounts, create up to 8 timers, and enjoy features like timer, delay control, and loop timer. Secure real time activity records allow you to track the history of switch activation or deactivation within the app. 4WIDE RANGE OF APPLICATIONS: Build your smart home with smart lights, fans, water pumps, humidifiers, and more. The for eWeLink app also offers scheduling, device sharing, and group management features. 5USER FRIENDLY DESIGN: This dual channel relay development board is designed with user convenience in mind, providing an intuitive interface, easy installation, and seamless integration with existing smart home systems.