Andream 4000mAh Ultra-Compact Portable Charger Lipstick-Sized External Battery Power Bank Pack for iPhone 5S, 5C, 5, 4S, Galaxy S5, S4, S3, Note 3, Nexus 4, HTC One, One 2 (M8), Nokia Lumia 520, 1020, most other Smartphones - Black LP-509A PVM Analog control: By the modulation of pulse width, it can reduce the energy consumption of recharging to prolong the li-battery life-time. Intelligent current shunt: The built-in intelligent control circuit can shunt the current when the power bank is self-charging and outputing at the same time. Intelligent multi-protection circuits: Provides a constant current to ensure secure charging. It can instantly disable the output when the output exceeds the rated current or short circuits to protect the circuit`s safety. Input: 5V 1A; Output: 5V 1A; Touch Switch + Hidden LED Capacity Indicator + 6 Converters + Velvet Pouch For most cell phones, tablets and other 5V digital devices