The protective cover 70 is provided with {HEAD ~ capacitance} 72 and {TAIL ~ a metal sensor} 73 
The protective cover 70 is provided with { HEAD ~ capacitance } 72 and { TAIL ~ a metal sensor } 73
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH