Panasonic K-KJ17MZ104A eneloop Power Pack; 10AA, 4AAA, and Advanced Battery Charger (battery color may vary) Recharge eneloop cells up to 2100 times Maintain up to 70% of their charge after 10 years (when not in use) Up to 2000mAh, 1900mAh min, Ni-MH pre-charged rechargeable battery 4 position charger with advanced, individual battery charging; charges both AA and AAA cells Battery detection technology - automatically shuts off when charging is complete