Special features: A streamlined, 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 extra cover can also be used as a battery organizer, safely storing the batteries. 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 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 dock for easy charging. Technical data: USB Charger Dimensions: 68x74x26mm Weight: 51.5g Number of charging slots / Channels: 4 / 4 LED indicator: - Green LED ON for 0.5 seconds after connecting via USB - Charging: Green LED flashes slowly - Fully charged: Green LED ON - Defective/Single-use batteries inserted: Red LED flashes quickly Output 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 / 1A Charging time (Input D.C. 5.0V 1.0A min., 2 batteries): - 2100mAh AA battery: 120 minutes - 850mAh AAA battery: 120 min.