BONAI LCD Universal Battery Charger. It's designed to charge multiple sizes of rechargeable batteries. Compatibility: Charges AA, AAA, C, D, and 9V Ni-MH/Ni-CD batteries. LCD Display: Shows charging status for each battery. Discharge Function: Can discharge batteries before charging. Safety Features: Multi-protection and trickle charge mode when fully charged. Error Detection: Identifies bad or non-rechargeable batteries. Individual Slots: Each slot charges one battery independently. Charging Time: Approximately 6 hours for C batteries. Versatile: Can charge different battery types simultaneously, but not under the same LED indicator.