Additional board Robot-WiFi AR9331 USB

Specification:
- Executive standard: IEEE802.11b/g/n
- Power supply voltage: 5V-+ 5%
- Memory: 32M 
- FLASH :4M 
- Interface: USB2.0, fast Ethernet port, serial port, I/O port, reset key
- RF input impedance: 50Ohm
- USB differential impedance: 90Ohm
- The crystal frequency: 25MHz
- Temperature: 0~80 deg C
- Storage temperature: -40~85deg C
- Frequency range: 2.402~2.48GHz
- Modulation mode: 802.11 g/n: OFDM
  802.11b:CCK  (11, 5.5Mbps), QPSK (2Mbps), BPSK (1Mbps)
- Output power: 802.11b: 17dBm -+1.5dBm (11Mbps)
  802.11g: 13dBm 1.5dBm  (54Mbps)
  802.11n:  HT20 13dBm 1.5dBm (MCS7 HT20)
  HT40 12dBm 1.5dBm (MCS7 HT40)
- Receiving sensitivity: 802.11b: 11M is less than -76dBm
  802.11g: 54M  is less than -65dBm
  802.11n:HT20 MCS7  is less than -64dBm
  HT40 MCS7  is less than -61dBm