iftop - how to select a wireless USB device

iftop - how to select a wireless USB device

I want to monitor my internet traffic, thinking of switching ISPs. I want
to monitor and log my traffic. iftop looks like a good option for the
(correct me if I'm wrong)
The problem is that my machine is using a USB wireless card. iftop will
default to eth0. What command do I use to listen in on my wireless USB
card traffic?
I'm running Ubuntu 12.4, here is my lspci output:
alan@alan-ubuntu:~$ lspci
00:00.0 Host bridge: Intel Corporation 5000V Chipset Memory Controller Hub
(rev b1)
00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8
Port 2-3 (rev b1)
00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
Port 3 (rev b1)
00:08.0 System peripheral: Intel Corporation 5000 Series Chipset DMA
Engine (rev b1)
00:10.0 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers
(rev b1)
00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers
(rev b1)
00:10.2 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers
(rev b1)
00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved
Registers (rev b1)
00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved
Registers (rev b1)
00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers
(rev b1)
00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers
(rev b1)
00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI
Express Root Port 1 (rev 09)
00:1d.0 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset
UHCI USB Controller #1 (rev 09)
00:1d.1 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset
UHCI USB Controller #2 (rev 09)
00:1d.2 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset
UHCI USB Controller #3 (rev 09)
00:1d.3 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset
UHCI USB Controller #4 (rev 09)
00:1d.7 USB controller: Intel Corporation 631xESB/632xESB/3100 Chipset
EHCI USB2 Controller (rev 09)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC
Interface Controller (rev 09)
00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller
(rev 09)
00:1f.2 IDE interface: Intel Corporation 631xESB/632xESB/3100 Chipset SATA
IDE Controller (rev 09)
00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus
Controller (rev 09)
01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream
Port (rev 01)
01:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X
Bridge (rev 01)
02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
Downstream Port E1 (rev 01)
02:02.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
Downstream Port E3 (rev 01)
03:00.0 VGA compatible controller: NVIDIA Corporation G92 [GeForce 8800
GT] (rev a2)
04:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit
Ethernet Controller (Copper) (rev 01)
04:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit
Ethernet Controller (Copper) (rev 01)
08:01.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
08:02.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI
ES1000 (rev 02)