A three-day China International Exhibition of Senior Care Rehabilitation Medicine and Healthcare, also known as China Aid, opens in the city today.

Among the features are a smart bracelet that can send an alarm to emergency services if its wearer falls down and a car with rotating and extending seats to help seniors get on and off easily.

The bracelet can detect the injury level of wearers and is waterproof. It provides ambulance crews with satellite positioning so they can react quickly. It also helps to ensure the safety of the elderly if they are walking alone, organizers said.