First, begin by telling them about some of the benefits of IoT devices such as:
saving electricity cost through the use of smart lightbulbs
getting useful information easily by means of voice command support devices. (Amazon Echo, Google home).
Next, mention some of the problems-assiociated with these IoT devices, such as:
security may be compromised: there are concerns that hackers can easily gain access to your private data on these IoT devices.
privacy issues: there is a possibility for your private information to be tracked, and accessed without your permission. For example, voice-enabled searches may be recorded and listened to by big corporations.