The SA40 operates on dual frequencies: 125kHz for EM cards and 13.56MHz for IC cards, including S50, S70, and IC EV1 types. This dual-frequency capability ensures compatibility with a wide range of RFID cards, accommodating existing access control systems and offering flexibility for future upgrades. The device's operating voltage ranges from DC 9 to 15V, making it adaptable to various power supply configurations. It functions effectively within an operating temperature range of -20°C to 60°C and a storage temperature range of -20°C to 80°C, ensuring reliable performance in diverse environmental conditions. 

Designed for ease of use, the SA40 allows administrators to add or delete users directly on the device, streamlining user management without the need for additional software. It features a built-in relay, door sensor, exit button, and doorbell interface, providing comprehensive access control functionalities. The device's scratch-proof plastic construction ensures durability and longevity, maintaining its appearance and functionality over time. Its sleek and compact design allows for seamless integration into various settings, including offices, residential buildings, and public facilities.