As sensors, smart computing and microprocessor technology flourish, the world of connected things is gradually being implemented in you and my life. The Internet of Things is a trend, but there is still a problem that is facing the battery. The current battery life of these devices is usually not very good, mainly because of the internal components to be used too much electricity. But recently a researcher from the Netherlands came up with a new solution that invented a miniature wireless temperature sensor with only 2 square millimeters, and the power supply of this sensor comes from the radio waves of the wireless network, The nearby route gets its power automatically, and once it's power-up it's time to get started without having the internal battery power it up. Now, the effective working range of this sensor is less than 1 inch and is not yet practical yet, but fortunately, the researchers' work continues. They hope to expand the effective range to 10 feet in a year, The ultimate goal is 16 feet. If the network brings enough waves, this invisible sensor can be applied to all smart home devices. In addition, the cost of this sensor is very low, as long as 20 cents, so we do not have to worry about using this technology equipment costs will rise dramatically.