low voltage led clock

econd:
1、      Led high of character：1＂red led 4 digital display,130X53X45mm；
2、              DC input
3、              4 digital time display
Third：function requirement
1、      Left two digital hours,right two digitals minutes
2、      When power cut,it has keep memory function。
Fourth：technical criteria
3、      Operational environment：temperature -10℃～50℃,relative humidity  0～95%；
 
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