| Model Name | FBU691 | FBU691Z | 
        | Part Number | HBFBU691-3455-B (Non-WIFI) | HBFBU691Z-3455-B (WIFI) | 
        | Motherboard Specification | 
        | CPU | Fanless Intel® Celeron J3455 Processor Quad Core 1.50 GHz - 2.30 GHz, 10W TDP | 
        | Memory | 1 * 204-pin DDR3L-1866 up to 8GB total, 1.35V required | 
        | Graphics | Intel HD Graphics 500, 250MHz - 750MHz (J3455) | 
        | LAN | 2 x Realtek RTL8111H Gigabit LAN | 
        | Audio | Realtek ALC662VD HD Audio & Intel® Display Audio | 
        | Storage | 1 x Full Size mSATA Slot | 
        | Wireless / Mini-PCIE / SIM | 1 x Half size Mini-PCI Express Slot 1 x SIM Card Socket
 | WiFi + Bluetooth 1 x SIM Card Socket
 | 
        | TPM | Intel fTPM 2.0 (PTT) Trusted Computing Firmware * As of 5/11/2020, onboard TPM is now optional
 | 
        | Chassis Specification | 
        | Product size | 125 * 109 * 55  mm | 
        | Material | Lightweight aluminum alloy with extruded aluminum IO panel | 
        | Color | Black | 
        | Front I/O Port | 1 * RS232/422/485 COM port 2 * USB 3.0
 1 * VGA (1920 x 1200 @ 60Hz)
 1 * Power Button with LED
 | 
        | Rear I/O Port | 1 * +12V 2.5mm Diameter DC-In Power Jack 1 * Line out / MIC in Combo Jack
 2 * HDMI 1.4b (3840 x 2160 @ 30Hz)
 2 * USB 3.0 port
 2 * RJ-45 port
 2 * SMA Connector for WiFi Antenna
 | 
        | Power | Adapter : AC_90~240V / DC_12V/40W | 
        | Environment | Operating Temperature : 0°C ~ 50°C with air flow Storage Temperature : -10°C ~ 70°C
 | 
        | Functional | Digital Signage, Set Top Box, Thin Client, Car Entertainment, Smart Mini PC, POS/POI, KIOSK, HTPC | 
        | Certificate | CE,FCC,ErP For Barebone CE,FCC,TUV,UL,CCC,CB,ErP For Power Adapter
 |