Voltage Monitoring Function - AV Control, Auto Switch to Trickle Mode After Full Charge 1 Hour Rapid Charger Safety Timer, Auto Cut-off After 2 Hours of Standard Charging Temperature Monitoring, Over-Heat Protection Charges From 1 to 4 pcs AA, AAA, NiMh or NiCd Batteries 4 Independent Charging Channels. 4 LED's Indicate Charging Status of Each Channel Bad Battery, Alkaline and Primary Battery Detection Supplied with 4 x 2500MAH Rechargeable Batteries Complete with 12V Car Adaptor