UHF RFID SAC Reader Modules, 4.1*2 cm small size design,module build-in antenna,reader tag sensing distance up to 2 meters, reading speed up to 300 Tag per second. ISO18000-6c compliant product, power 10~27dBm, operating voltage 3.6V~5.5V, interface of UART TTL, and simple AT instructions. Designed for various RFID products(eg. Access permission, stock take, product check, patrol management, automatic elevators ...etc.) With its small size, it is especially designed for handheld reader devices.