EBL Rechargeable AAA Batteries 16-Packs (ProCyco 1100mAh) with AA AAA Smart Battery Charger - ETL Certified Great for use in your household devices, such as digital cameras, toys,  remote controls,hand held games, 2-way radios, PDAs, flashlights,alarm-clocks, LCD-TVs, Toothbrushes, Shavers and portable audio players, delivering dependable power allowing you to maximize your  music, gaming, computer, photography and other experiences. They come pre-charged and can be used immediately out of the package. EBL batteries can be recharged up to 1200 times when fully or partially drained which makes it extremely economical, and provides an expected life similar to that of the device in which it is used. Improved low self  discharge makes it still maintain 75% of capacity after 3 year of  non-use. LED state the charging statues : on(charging)- shows green(fully charged) Overheat-detection to prevent over-charging Short circuit protection and reverse polarity protection Negative delta V (- V) cut-off function,automatically cut off when fully charged Can both charge AA and AAA Ni-MH Ni-Cd rechargeable batteries(Do not charge alkaline or Lithium batteries) 2/4/6/8 AA or AAA batteries together at a time, need to charge batteries in pairs, do not charge uneven amount of batteries 4 LEDs show the status of charging, never charge 1 AA + 1 AAA together at 2 slots which are controlled by 1 LED Input: AC 100-120V AC 50/60Hz. Worldwide voltage Output: DC 2.8V 1000mA,0.4V output voltage more than most similar charger means faster for charging 16 X EBL 1100mAh AAA rechargeable batteries 4 X Battery storage cases 1 X Charger 1 X AC adapter cable