usbdevs -v 
Controller /dev/usb0: 
addr 1: self powered, config 1, UHCI root hub(0x0000), Intel(0x0000), rev 1.00 
 port 1 addr 2: low speed, power 100 mA, config 1, PS2/USB Browser Combo Mouse(0x0011), Cypress Sem(0x05fe), rev 0.00 
 port 2 powered 
 
/var/log/messages: 
kernel: ums0: Cypress Sem PS2/USB Browser Combo Mouse, rev 1.00/0.00, addr 2, iclass 3/1 
kernel: ums0: 5 buttons and Z dir.