Electronic chopsticks that can detect whether food is unsafe to eat have been unveiled by Chinese tech company Baidu.

The search giant said the utensils could detect unsanitary cooking oil - a common concern in the country.

At its annual conference in Beijing, Baidu also unveiled its own wearable headset, a rival to Google's Glass.

The Baidu Eye has an in-built camera but no screen, and conveys information to the user via an earpiece or by connecting to a smartphone.