Smart Wi-Fi Roller Shutter Timer MRS100 • Control your device from anywhere anytime with the Meross app & Apple Home App. • Works with Apple HomeKit, Siri, Amazon Alexa, Google Assistant, and SmartThings. • Create on/off schedules timers to work automatically. • LED indicator helps find the switch easily, even at night. • Works with the Wi-Fi you already have. No hub required. • Neutral wire (blue wire) required. Works with 2.4GHz Wi-Fi only.