This Sony battery charger is compatible with both AA and AAA sizes and can hold up to 2 AA or 4 AAA batteries. It is a rechargeable NiMH battery charger with a model number of BC-CS2A and a power output of 3 watts. This product is perfect for those who need to charge their batteries on-the-go or at home. It is important to note that this product is not modified and comes with no additional batteries included. The charger is made by Sony and manufactured in China. This battery charger is a great addition to any collection and is perfect for those who need a reliable and efficient way to charge their NiMH batteries.