The blazing fast NITECORE Q4 4-Bay Charger has finally arrived! This blazing fast charger comes with 100% faster charging speeds capable of producing a 2000mA charging output in a single slot, ensuring your batteries are ready-to-go when you need them the most. An optimized charging system monitors the entire charging process and ensures voltage is always within safe limits to help extend battery life. Equipped with reverse polarity technology, short circuit and overcharging protection to prevent damage to the unit and batteries. If anything unusual is detected, the unit will alert you by blinking red above the corresponding battery slot making the Q4 charger a safe choice for all your charging needs. It's as simple as insert, detect, and charge.