ADATA PV100 4200mAh Untra Slim Power Bank, Black (APV100-4200m-5V-CBK) Double Fast Charging: With a robust 2.1A of electrical current, the PV100 can charge devices twice as fast as the common 1000mA chargers seen on the market. Ultra-Slim Profile: With a thickness of only 8mm, the PV100 is an easy and comfortable way to carry extra power in any bag or pocket. Broad Device Compatibility: Almost any microUSB powered mobile device can be quickly charged by the PV100. Safety Mechanisms- Charging: OTP - Over-Temperature Protection; SCP - Short Circuit Protection; OVP - Over-Voltage Protection ; OCP - Overcharge Protection. Safety Mechanisms- Discharging: ODP - Over-Discharge Protection ; OCP - Over-Current Protection.