SOLDERING： 1.  Soldering Bath-260℃±5℃ within 3seconds.(Dip depth should under 1/16 inch  below seating plane.) 2.  Soldering Iron-Under 40W with 3seconds.(Tip tenperature:230±5℃.) 3.  The neutrality flux must be used before soldering.   CLEANING：     Don't use unspecified chemical liquid to clean display, They could harm the display. If cleaning is necessary, wipe the pin out with alcohol, Freon TE or Chlorosen at normal temperature for less then 1 minute, or wipe the surface with alcohol, When other chemical solutions not specified are used, It may cause crack or haze on the surface of the display.   PREVENTION OVERCURRENT： 1.  Be not over current.SOLDERI 2.  In order to cooperate BRIGHT LED displays under stable conditions . Put protective resistors in stride, Resistor values can determined by supplying voltage or current for the LED display .Recommended current is in the range of forward current 5mA to 20mA . 3.  Circuit must be designed so that over voltage (over current )is not applied the LED during on/off switching .Transient or pulse current will damage the junction of LED die .   BRIGHTNESS： 1.  For obtaining even brightness .Each segment should be at the same current , so best circuit design is to supply constant current for each segment 2.  TO increase even brightness . But do not over maximum rating. 3.  To check the appearance defect of LED display ,the viewing distance should be 25cm minimum . 4.  For obtaining more uniform brightness on yellow and green display . The supplying forward current should be over 10Ma,But do not be rating .