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• The presence of soft, absorbent materials such as paper, fiberglass insulation, foam
material in office cubical walls, carpeting and, to a lesser extent, even sheetrock and
wood construction materials.
• Human bodies or containers of liquid positioned between the host and the CHS.
• The presence and activity level of competing Bluetooth, 802.11 (Wi-Fi) or other
(proprietary) systems using the same 2.4 GHz frequency.
• Metal in a grid pattern, such as chain link fencing or chicken wire. This type of material
may block the Bluetooth (or Wi-Fi) signal completely.