HelloTag is an interactive tag system to help shopping of the elderly and the handicapped. When the elderly and handicapped people go shopping, it is hard for them to check information on tags such as price, size, materials etc. HelloTag is designed to improve their shopping experience. RFID system is applied in HelloTag, which consists of RFID tags, and a main device as RFID writer and reader. Detailed explanation of goods can be stored with sound data in RFID tags by using the main device as a microphone. When customers do shopping, they can listen to information with voice from the main device by pressing the button on it.