ZK S900 - Optional Card Readers and WiFi; Optional HID Card Reader; Optional WiFi Connectivity

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3.6 Built-in HID card reader (Optional)
When using the optional HID card reader, flash the card 2 to 4 inches
from the card reader. The HID card reader supports HID cards that
operate at a frequency of 125KHZ.
3.7 Built-in WiFi (Optional)
The S900 has a Wi-Fi (wireless fidelity) option which allows the S900 to
communicate with 802.11 local area networks (802.11b and 802.11g,
dual-band, etc.).
• IEEE802.11b Standard Data Rates: 1, 2, 5.5 and 11Mbps.
• Support IEEE 802.11g compliant DSSS, CCK, OFDM
modulation
• IEEE802.11g Standard Data Rates: 6, 9, 12, 18, 24, 36, 48,
54Mbps .
Illustration of F4 in a Wi-Fi environment