Smart plugs, lights, curtains which can play with Alexa/Echo. These devices are provided by Aztech Technologies Pte Ltd. You can use this skill by following the steps: 1. You must register account by HDB SmartHome Application and add HDB SmartHome smart devices to your account. 2. Then you need to search HDB SmartHome skill on Amazon Alexa App, and enable HDB SmartHome skill. 3. After the HDB SartHome skill is enabled, you can find your HDB SmartHome smart devices on the Amazon Alexa App. 4. Now you can control your HDB SmartHome smart devices both by Amazon Alexa App and Alexa/Echo.