Mode 2 : On : Flash : Off *: Only for real-time commands. 20 Battery LED Error LED Remaining battery charge Printing Communication Level H Approx. 60 ~ 100% Possible Possible Level M Approx. 20 ~ 60% Possible Possible Level L Approx. 10 ~ 20% Possible Possible Level S Approx. below 10% Impossible Possible* Level E Approx. 0% Impossible Impossible