【Easy Installation】: Compatible with 118/120 type wall box ( not multi-switch lights). Neutral wire required.Very easy to install, only 3 steps with APP, simple installation procedures listed in user manual., 【SATISFACTION GUARANTEE】: The smart wifi light switch ETL & FCC approved for safety and quality assurance, safe in use, We offer you 100% Satisfaction Guarantee, 【Smartphone APP Control】: Works with any smartphone with Android 4.1 and higher or iOS 8 and higher. Connect devices to the Smart Switch wherever you have Internet using the free APP on your smart-phone.ONLY WORK WITH 2.4GHz Wi-Fi, 【Compatible with Amazon Alexa】: Save yourself the effort of pressing buttons and give your voice command!Turn on/off the light via voice control with Amazon Alexa & Google Assistant,also support Alexa Echo, Echo Dot, Echo Plus, Echo Tap, Echo Sport, Echo Show. Google Home, Google Home Mini, Google Home Max and Google Nest, 【LED Backlight Indicator】: Big key touch design, sensitive and soft. You can turn on your lights worry – free in the dark night.