def SignalStrength(value):
    """
    Returns a string indicating the signal strength of the WiFi signal
    in human-readable terms.

    Based on the table from:
    https://www.metageek.com/training/resources/understanding-rssi.html

    :param value: WiFI signal strength RSSI value
    :return: String represent signal strength
    """
    if value > -30:
        return 'Excellent'
    if value > -67:
        return 'Very Good'
    if value > -70:
        return 'Good'
    if value > -80:
        return 'Poor'
    if value > -90:
        return 'Weak'
    return 'N/A'