The Sound Associates SA1930 Smart Chargers take the next step in the evolution of infrared system battery chargers, offering both drop-in charging stations for ease of distribution and charging slots for additional batteries. Each charging position has a multi-color LED indicator that lights when a battery is properly inserted. Red indicates uncharged. As the battery continues its trickle charge the LED will change to green when it is fully charged. This exciting feature virtually eliminates distribution of insufficiently charged or non-functioning batteries.