@classmethod
def getDescription(cls, str_):
    """Get description."""
    if not str_ or str_[0] != '$':
        return ''
    value = int(str_[1:])
    if value == 1:
        ret = 'Sum Li Active power+ (QI+QIV)'
    elif value == 2:
        ret = 'Sum Li Active power- (QII+QIII)'
    elif value == 3:
        ret = 'Sum Li Reactive power+ (QI+QII)'
    elif value == 4:
        ret = 'Sum Li Reactive power- (QIII+QIV)'
    elif value == 5:
        ret = 'Sum Li Reactive power QI'
    elif value == 6:
        ret = 'Sum Li Reactive power QII'
    elif value == 7:
        ret = 'Sum Li Reactive power QIII'
    elif value == 8:
        ret = 'Sum Li Reactive power QIV'
    elif value == 9:
        ret = 'Sum Li Apparent power+ (QI+QIV)'
    elif value == 10:
        ret = 'Sum Li Apparent power- (QII+QIII)'
    elif value == 11:
        ret = 'Current: any phase'
    elif value == 12:
        ret = 'Voltage: any phase'
    elif value == 13:
        ret = 'Sum Li Power factor'
    elif value == 14:
        ret = 'Supply frequency'
    elif value == 15:
        ret = 'Sum Li Active power (abs(QI+QIV)+abs(QII+QIII))'
    elif value == 16:
        ret = 'Sum Li Active power (abs(QI+QIV)-abs(QII+QIII))'
    elif value == 17:
        ret = 'Sum Li Active power QI'
    elif value == 18:
        ret = 'Sum Li Active power QII'
    elif value == 19:
        ret = 'Sum Li Active power QIII'
    elif value == 20:
        ret = 'Sum Li Active power QIV'
    elif value == 21:
        ret = 'L1 Active power+ (QI+QIV)'
    elif value == 22:
        ret = 'L1 Active power- (QII+QIII)'
    elif value == 23:
        ret = 'L1 Reactive power+ (QI+QII)'
    elif value == 24:
        ret = 'L1 Reactive power- (QIII+QIV)'
    elif value == 25:
        ret = 'L1 Reactive power QI'
    elif value == 26:
        ret = 'L1 Reactive power QII'
    elif value == 27:
        ret = 'L1 Reactive power QIII'
    elif value == 28:
        ret = 'L1 Reactive power QIV'
    elif value == 29:
        ret = 'L1 Apparent power+ (QI+QIV)'
    elif value == 30:
        ret = 'L1 Apparent power- (QII+QIII)'
    elif value == 31:
        ret = 'L1 Current'
    elif value == 32:
        ret = 'L1 Voltage'
    elif value == 33:
        ret = 'L1 Power factor'
    elif value == 34:
        ret = 'L1 Supply frequency'
    elif value == 35:
        ret = 'L1 Active power (abs(QI+QIV)+abs(QII+QIII))'
    elif value == 36:
        ret = 'L1 Active power (abs(QI+QIV)-abs(QII+QIII))'
    elif value == 37:
        ret = 'L1 Active power QI'
    elif value == 38:
        ret = 'L1 Active power QII'
    elif value == 39:
        ret = 'L1 Active power QIII'
    elif value == 40:
        ret = 'L1 Active power QIV'
    elif value == 41:
        ret = 'L2 Active power+ (QI+QIV)'
    elif value == 42:
        ret = 'L2 Active power- (QII+QIII)'
    elif value == 43:
        ret = 'L2 Reactive power+ (QI+QII)'
    elif value == 44:
        ret = 'L2 Reactive power- (QIII+QIV)'
    elif value == 45:
        ret = 'L2 Reactive power QI'
    elif value == 46:
        ret = 'L2 Reactive power QII'
    elif value == 47:
        ret = 'L2 Reactive power QIII'
    elif value == 48:
        ret = 'L2 Reactive power QIV'
    elif value == 49:
        ret = 'L2 Apparent power+ (QI+QIV)'
    elif value == 50:
        ret = 'L2 Apparent power- (QII+QIII)'
    elif value == 51:
        ret = 'L2 Current'
    elif value == 52:
        ret = 'L2 Voltage'
    elif value == 53:
        ret = 'L2 Power factor'
    elif value == 54:
        ret = 'L2 Supply frequency'
    elif value == 55:
        ret = 'L2 Active power (abs(QI+QIV)+abs(QII+QIII))'
    elif value == 56:
        ret = 'L2 Active power (abs(QI+QIV)-abs(QI+QIII))'
    elif value == 57:
        ret = 'L2 Active power QI'
    elif value == 58:
        ret = 'L2 Active power QII'
    elif value == 59:
        ret = 'L2 Active power QIII'
    elif value == 60:
        ret = 'L2 Active power QIV'
    elif value == 61:
        ret = 'L3 Active power+ (QI+QIV)'
    elif value == 62:
        ret = 'L3 Active power- (QII+QIII)'
    elif value == 63:
        ret = 'L3 Reactive power+ (QI+QII)'
    elif value == 64:
        ret = 'L3 Reactive power- (QIII+QIV)'
    elif value == 65:
        ret = 'L3 Reactive power QI'
    elif value == 66:
        ret = 'L3 Reactive power QII'
    elif value == 67:
        ret = 'L3 Reactive power QIII'
    elif value == 68:
        ret = 'L3 Reactive power QIV'
    elif value == 69:
        ret = 'L3 Apparent power+ (QI+QIV)'
    elif value == 70:
        ret = 'L3 Apparent power- (QII+QIII)'
    elif value == 71:
        ret = 'L3 Current'
    elif value == 72:
        ret = 'L3 Voltage'
    elif value == 73:
        ret = 'L3 Power factor'
    elif value == 74:
        ret = 'L3 Supply frequency'
    elif value == 75:
        ret = 'L3 Active power (abs(QI+QIV)+abs(QII+QIII))'
    elif value == 76:
        ret = 'L3 Active power (abs(QI+QIV)-abs(QI+QIII))'
    elif value == 77:
        ret = 'L3 Active power QI'
    elif value == 78:
        ret = 'L3 Active power QII'
    elif value == 79:
        ret = 'L3 Active power QIII'
    elif value == 80:
        ret = 'L3 Active power QIV'
    elif value == 82:
        ret = 'Unitless quantities (pulses or pieces)'
    elif value == 84:
        ret = 'Sum Li Power factor-'
    elif value == 85:
        ret = 'L1 Power factor-'
    elif value == 86:
        ret = 'L2 Power factor-'
    elif value == 87:
        ret = 'L3 Power factor-'
    elif value == 88:
        ret = 'Sum Li A2h QI+QII+QIII+QIV'
    elif value == 89:
        ret = 'Sum Li V2h QI+QII+QIII+QIV'
    elif value == 90:
        ret = (
            'SLi current (algebraic sum of the unsigned value of the currents in all phases)'
            )
    elif value == 91:
        ret = 'Lo Current (neutral)'
    elif value == 92:
        ret = 'Lo Voltage (neutral)'
    else:
        ret = ''
    return ret
