The RDM built-in contact smart IC card reader supports reading and writing contact smart cards, complies with ISO7816 standards, such as commonly used storage cards and logic encryption cards. Supports push-pull card holder types, and the RDM built-in reader can be placed inside a PC (3-inch soft drive size), powered by 5V from the computer motherboard. The dual color indicator light and buzzer can serve as a reminder to avoid blind operation and malfunction; Contact based read and write modules can be provided separately, making it easy to embed into large devices such as POS terminals, access control devices, and vending machines.