Special featuresStreamlined, fast charger with smart technical features and safety provisions that can charge up to 4 AA or AAA batteries simultaneously.The sturdy case with an additional cover can also be used as a battery organizer, keeping the batteries safely stored.The charger fully charges 2 batteries in approximately 2 hours or four batteries in approximately 4 hours (2100mAh AA batteries) via a USB connection.The two-color LED display not only indicates the charging status but also if single-use or defective batteries are inserted.Other safety features include an automatic power cut-off and the detection of fully charged batteries, which helps prevent overcharging.Additionally, the charger is protected against overvoltage and short circuits for optimal battery life.With a dual dock for easy charging.Technical dataDimensions: 82 x 82 x 27mmWeight: 51.5gNumber of charging slots / Channels: 4 / 4LED indicator: 4- Green LED ON for 0.5 seconds after connecting via USB- Charging: Green LED blinks slowly- Fully charged: Green LED ON- Defective/Single-use batteries inserted: Red LED blinks rapidlyOutput Voltage / Charging Current-D.C. 1.4V / 1100mA (for 1-2 AA Batteries)-D.C. 1.4V / 730 - 550mA (for 3-4 AA Batteries)-D.C. 1.4V / 730mA (for 1-2 AAA Batteries)-D.C. 1.4V / 490 - 370mA (for 3-4 AAA Batteries)USB power input: D.C. 5V / 1ACharging time (Input D.C. 5.0V 1.0A min., 2 batteries):- 2100mAh AA battery: 120 minutes- 850mAh AAA battery: 120 min.Safety features:- Timer protection - 8 hours-Full charge detection- Temperature cut-off