Slim power bank emergency battery with PU and ABS Rubber coating. Metallic side center panel lights up to show off logo. Power/Technology: Two Rechargeable Lithium Polymer batteries; 3.7V; Capacity: 8000 mAh (4000 mAh each); Input: DC 5V/2.0A; Output: DC 5V/ 1A & 2.1A; Work current: 2000 mA; Standby current