$ cat  /proc/bus/input/devices
I: Bus=0003 Vendor=046d Product=c517 Version=0110
N: Name="Logitech USB Receiver"
P: Phys=usb-0000:00:1d.0-1/input0
S: Sysfs=/class/input/input0
U: Uniq=
H: Handlers=kbd event0
B: EV=120003
B: KEY=10000 7 ff800000 7ff febeffdf ffefffff ffffffff fffffffe
B: LED=1f

I: Bus=0003 Vendor=046d Product=c517 Version=0110
N: Name="Logitech USB Receiver"
P: Phys=usb-0000:00:1d.0-1/input1
S: Sysfs=/class/input/input1
U: Uniq=
H: Handlers=kbd mouse0 ts0 event1
B: EV=f
B: KEY=7fff 42c332f bf084440 0 0 ff0001 1f84 8837cc00 667bfa dd71dfed 9e0000 0 0 0
B: REL=1c3
B: ABS=1 0

I: Bus=0003 Vendor=046d Product=c51a Version=0111
N: Name="Logitech USB Receiver"
P: Phys=usb-0000:00:1d.0-2/input0
S: Sysfs=/class/input/input2
U: Uniq=
H: Handlers=mouse1 ts1 event2
B: EV=7
B: KEY=ffff0000 0 0 0 0 0 0 0 0
B: REL=143

I: Bus=0003 Vendor=046d Product=c51a Version=0111
N: Name="Logitech USB Receiver"
P: Phys=usb-0000:00:1d.0-2/input1
S: Sysfs=/class/input/input3
U: Uniq=
H: Handlers=kbd event3
B: EV=f
B: KEY=7fff 2c3027 bf004440 0 0 1 f80 8837c000 667bfa d9415fed 8e0000 0 0 0
B: REL=40
B: ABS=1 0

I: Bus=0010 Vendor=001f Product=0001 Version=0100
N: Name="PC Speaker"
P: Phys=isa0061/input0
S: Sysfs=/class/input/input4
U: Uniq=
H: Handlers=kbd event4
B: EV=40001
B: SND=6

I: Bus=0019 Vendor=0000 Product=0002 Version=0000
N: Name="Power Button (FF)"
P: Phys=button_power/button/input0
S: Sysfs=/class/input/input5
U: Uniq=
H: Handlers=kbd event5
B: EV=3
B: KEY=100000 0 0 0

I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button (CM)"
P: Phys=PNP0C0C/button/input0
S: Sysfs=/class/input/input6
U: Uniq=
H: Handlers=kbd event6
B: EV=3
B: KEY=100000 0 0 0