Output of `iwconfig wlan0`:

wlan0     IEEE 802.11bgn  ESSID:"C5O-R4R"  
          Mode:Managed  Frequency:2.442 GHz  Access Point: 00:1F:1F:67:DA:48   
          Bit Rate=86.7 Mb/s   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=42/70  Signal level=-68 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:29   Missed beacon:0