This is a practical example of UHF LED label. Introducing the use of UHF LED label in combination with smart tool trolley to solve the difficulty of finding the desired tool among hundreds of similar-looking tools. UHF LED label is attached to each tool package. After using RFID reader to take inventory of these labels, select the desired tool on the screen, and the RFID reader will transmit a signal. When the UHF LED label receives the signal, the RFID chip will activate the LED light and emit flashes of light, helping the user to quickly find the corresponding tool. UHF LED label can also be used to quickly locate assets such as archives, books, cables, jewelry, biological samples, logistics boxes, etc.