EBL Individual Smart Battery Charger for AA AAA Ni-MH Ni-CD Rechargeable Batteries Individual charging status for each slot, can charge battery singly or in pairs 4 LEDs show the charging process.the LEDs display RED when put batteries into the charger;the LED light become weaker and weaker along with the charging process ;automatically switches to trickle charge when charging is complete to ensure maximum battery capacity Very safe products,good at shedding heat,automatically stop charging when voltage up to 3.4V Short Circuit & Input Voltage Detection/Protection DC 5V 1000mA input for worldwide usage, 250mA*4 output