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WiFi Module 5BK (WiFi and Bluetooth)

In Stock


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WIFI Module 5BK is a FCC / CE certified module that uses the same chipset (Realtek RTL8821CU) as WIFI Module 5B, so it is 100% compatible. IEEE 802.11ac/a/b/g/n WLAN and Bluetooth combo module with on-board 2.4Ghz and 5.8Ghz Dual band antenna.

Only one minor difference from the previous 5B model is that doesn’t have a CD-ROM mode. So, we can skip the usb-modeswitch tweak.

Works with ODROID series, Compatible with Android and Linux. (Please update your OS to the latest version if it doesn’t work.)

Links to compliance documentation available at the bottom of this listing.


  • Realtek RTL8821CU chipset ( USB ID = 0BDA:C813, No CDROM mode )
  • Dual-Band 11ac 1×1 with 64/128/152 bit WEP, WPA/WPA-PSK,WPA2/WPA2-PSK securities
  • Frequency Range: 2.4-2.483GHz ; 5.725~5.825GHz
  • Support WLAN Standards: IEEE802.11ac/a/b/g/n
  • Transfer Speed : ~200 Mbps
  • Support Bluetooth 2.1/3.0/4.2 (No BLE)
  • USB 2.0 High-Speed host interface
  • Antenna Gain: 2dBi
  • Dimension : 28 x 16 x 7 mm
  • LED for WiFi Link Activity
  • Frequency Range: 2.4-2.483GHz ; 5.725~5.825GHz
  • Weight : 5 g





  • Note that WiFi Module 5BK is an OEM model of CF-813B.



    Experimental test with N2+ USB port.

    Equipments for test
    ODROID-N2+ with Ubuntu 20.04.2, updates as Feb-2021.

    Test envierenmant
    Server – x86 HOST PC
    Client – ODROID Boards
    Test utility – iperf
    Wireless router(AP) – ipTIME A2008
    Test Block Diagram
    ODROID ↔ Wireless ↔ AP ↔ Ethernet ↔ PC

    Equipment was kept 1.5 meters apart during all tests, no obstructions.
    Software used: iperf version 2.0.13 (21 Jan 2019) pthreads


    (1) Channel Connection Statistics
    [ 5GHz ] IEEE802.11AC
    Channel : 161 (5.805 GHz)
    Signal : -34 dBm
    Rate : 434 Mbps
    Power Save : Note Enabled (Off)

    (2) 5GHz Download : 225 Mbps
    [ ID] Interval Transfer Bandwidth
    [ 3] 0.0-60.0 sec 1.57 GBytes 225 Mbits/sec

    (3) 5GHz Upload : 238 Mbps
    [ ID] Interval Transfer Bandwidth
    [ 4] 0.0-60.1 sec 1.67 GBytes 238 Mbits/sec

    (4) 5Ghz Duplex
    [ ID] Interval Transfer Bandwidth
    [ 5] 0.0-30.0 sec 893 MBytes 250 Mbits/sec
    [ 4] 0.0-30.1 sec 169 MBytes 47.2 Mbits/sec



    (1) Channel Connection Statistics
    [ 2.4Hz ] IEEE802.11bgn
    Channel : 5 (2.432 GHz)
    Signal : -45 dBm
    Rate : 150 Mbps
    Power Save : Note Enabled (Off)

    (2) 2.4GHz Download : 81.2 Mbps
    [ ID] Interval Transfer Bandwidth
    [ 4] 0.0-60.2 sec 583 MBytes 81.2 Mbits/sec

    (3) 2.4GHz Upload : 53.7 Mbps
    [ ID] Interval Transfer Bandwidth
    [ 3] 0.0-60.1 sec 384 MBytes 53.7 Mbits/sec

    (4) 2.4GHz Duplex
    [ ID] Interval Transfer Bandwidth
    [ 5] 0.0-30.0 sec 360 MBytes 101 Mbits/sec
    [ 4] 0.0-30.1 sec 83.6 MBytes 23.3 Mbits/sec

    Warranty is valid for 30 days, starting upon date of receipt.

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    Customer Reviews

    Based on 1 review
    Too tight and broke removing

    All of my Ameridroid items have been top notch but this USB dongle had something wrong with it. The dongle was so tight I thought something was wrong with the board. I did get it to fit but when I tried to remove it the dongle was so tight it did not want to come out. When it did the plastic cover broke off and the board slid out without the other piece coming out completely. I removed that piece and when I put in my WIFI dongle from my DE10 it fit in all ports and came out easily as it should. I could have received one that was just off so not saying it does not work good. I put it all back together but did not want to risk something on it blowing up my board so in the trash it went. Again I could have just got one not made well but cannot recommend it based on my experience.