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It’s a compact USB keyboard made by the brand BTC (Behavior Tech Computer Corp.).
The model 5139U has around 86–91 keys, including about 5 hot‑keys for quick access to functions like media or internet.
It’s USB‑connected, designed for Windows PCs, and is relatively small and lightweight.
Brand/Model: BTC 5139U
Type: Wired USB keyboard (classic design)
Interface: USB (USB‑A connector)
Compatible Systems: Windows/IBM PC‑compatible systems
Form Factor: Compact keyboard without full numeric keypad
Total Keys: ~91 keys
Additional/Hot Keys: 5 multimedia or shortcut keys
Key Type: Membrane switch mechanism
Key Travel: Approx. 3.2 mm
Width: ~319 mm
Depth: ~157 mm
Height: ~20 mm
Weight: ~0.45 kg
Construction: Traditional low‑profile keys
Color: Typically grey
Numeric Key Block: No dedicated numeric keypad (compact design)
Backlighting: No backlight
Trackball/Touchpad: Not included
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