UNIVERSAL: The LLOYTRON Plugin Home Battery Charger is compatible with NiMh and NiCd batteries in sizes AA, AAA and 9v (PP3). Charge 1 to 4 batteries at one time (dependent on battery size). EASY TO OPERATE: Simply plug in to a standard UK mains socket and insert your rechargeable batteries into the appropriate sized compartment. The red light will indicate that a battery has been inserted and leave to charge for the recommended time. RECHARGE: Recharge your batteries to their full capacity quickly and safely. The charging rate for AA is 1.2v DC 150mA, for AAA is 1.2v DC 50mA and for PP3 is 9v DC 10mA. DURABLE: Many rechargeable batteries can be recharged up to 1000 times, providing long lasting power to your everyday devices again and again. Save money and reduce waste without the need for disposable batteries. BUILT-IN SAFETY FEATURES: The over charge protection and reverse polarity protection/automatic short circuit protects the battery against current fluctuation for safe operation.