Features:                                                      1. Similar size as credit card2. power bank especially recommended as Promotion gift3. Li-polymer battery,Website: , safer4. home designed PCB board with high conversion rate and safe  electrocircuit 5. Build-in micro USB cable, hot for promotion6. OEM graphics on the surface Specification:                                                  Capacity: 1800mAh/2000mAh/2500mAh optionalMeterial: Li-polymer battery + ABS + metalColor: White/Black/OrangeVoltage/Current: Input: DC5V/1000mA  Output:DC5V/1000mACharging time: 3-4 hoursLifecycle: ≥500 timesPower indicator: YesLED flash light: NoLCD display: NoSize/Net Weight: 79*79*8mm  72gInput/Output: Michro input for charging,  one USB output interface for dischargingFeature: Compact design and portableAccessories: Use maual, USB cableLead time: 15 days credit card power bank