Multi-function office folio with PU faux leather magnetic closure cover, refillable lined paper sheets and ABS Plastic power bank to recharge your devices on the go. Power/Technology: Rechargeable lithium-ion battery - Capacity: 3.7V / 4000 mAh; Input: DC 5V/1500mA (Maximum Input: DC 5.3V / 2000mA); Output: 5V/2100mA; Work Current: 1500mA; Standby current: less than 0.3; UL Certified (UL File # MH60484) FCC approved. Power bank must be charged prior to first use. Charge time varies by device, minimum 4-6 hours. Includes USB charging cable and instructions. FCC approved. WARNING: Refer to the item manual for safety and warning instructions.