The Basic BQ CC51 charger can charge 2 or 4 AA or AAA batteries of the type Ni-MH at a time. The charging control is with a timer, which is cut after 13 hours. It takes approximately 10 hours to charge AA or AAA batteries. It is compatible worldwide (from 100 V to 240 V). The case colour is white and it has lead-free soldering. This way, this charger is less harmful for the environment. It also disposes of the function 'non rechargeable detection' for safety reasons. That means that if you put in a non-rechargeable battery, the charger will not work. Free 5 year warranty is included.