It charges 2 x AA 2,100mAh batteries in 2 hours via USB connection. The dual colour LED display indicates charging status as well as if any single-use or bad batteries are inserted. Another safety detail is the auto power cut-off timer and -dV full charge detection, which helps you avoid over-charging, over- voltage and short circuiting, as well as preventing damage to the battery lifespan.
This versatile charger works via USB or any Recyko charger dock (specially developed for Recyko charger models B421 and M451). With 4 x AA 2,600mAh rechargeable batteries included, you're good to go with this optimal charging solution.