usbdevs -v: 
port 1 addr 2: low speed, power 26 mA, config 1, N48(0xc001), Logitech(0x046d), rev 4.01 
 
insert: 
ums0: Logitech N48, rev 1.00/4.01, addr 2, iclass 3/1 
ums0: 3 buttons and Z dir. 
 
remove: 
ums0: at uhub0 port 1 (addr 2) disconnected 
ums0: detached