A smart nursing bottle for infants that lets working mothers know everything from the temperature of the milk to the posture of the nanny pouring it and a watch-controlled drone are among the products mainland companies are showing at the Global Sources exhibition at AsiaWorld-Expo in Hong Kong. The Shenzhen-based Ihotku Technology Company says its smart bottle can keep working mothers across the world free of worry and anxiety. "The idea was inspired by the suffering of one of my female employees who has to work and leave her infant alone with a nanny," said Qiu Zengchao, the company founder. The bottle enables mothers to understand "in real time" their baby's nursing state - such as the temperature of the milk it is consuming, how much it has consumed, and even whether the nanny has dropped the bottle. "There are seven sensors, as well as a central processing unit, to analyse the nanny's posture when pouring out milk and the accelerated speed of the milk flow. "After analysing the data, the nursing bottle can tell the mother in real time whether the infant is drinking milk or if the nanny is pouring it out," Qiu said. "The feedback of overseas buyers at the exhibition has been quite good and positive," Qiu said. "Our product may not be as high-end and complicated as those tech-giant-backed smart products, but it really fulfils the spirit of the smart home and creates a new market," he said. Also on show is a drone controlled by a smart GPS watch made by Shenzhen Simtoo Intelligent Technology Company. Zhang Qingqi, the company's CEO, hopes to make the dragonfly drone - which incorporates a 4K sport camera - the top choice for customers seeking "a point and shoot" drone to take selfies. "Our drone is the first of its kind to be controlled by a specific-designed smart GPS watch, which has functions of one-key take off, automatic following and circling and hover shooting." Zhang said. "Compared to giant drone makers like DJI, our 1.3kg drone is smaller, lighter and much easier to use. Even a little girl could control the drone through the watch," he said. "Our crowdfunded sales have reached US$1 million in the past 45 days." Demand for hi-tech products such as drones and robots is soaring. Global Sources estimates worldwide revenue for drones will hit US$1.27 billion by 2020. Two other products with their own patents - a wearable virtual reality headset and a gimbal for fast-moving photographers - were also proving a hit with the public at the exhibition. Launched in June, 3Glasses is the first virtual reality headset to incorporate a 2K resolution display, according to its developer Shenzhen Virtual Reality Technology Company. "It's also the first of its kind where the users have no need to take off their glasses. "It's very suitable for mainland game players," the company's Philip Kong said. "We have 46 related patents," Kong added. "So far we have sold more than 10,000 units on the mainland." He said the headsets had created a new market as many shopping malls across the country had bought the headsets to sell 15-minute theatre experiences to consumers for about 40 yuan (HK$49) each.