{HEAD ~ The device} 1, wherein said photoreceiver is {TAIL ~ a CdS photoresistor} 
{ HEAD ~ The device } 1 , wherein said photoreceiver is { TAIL ~ a CdS photoresistor }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL