Photive 8400mAh Portable Backup Battery Charger Power Bank. 5 V / 3.7a Dual USB outputs for simultaneous device charging. Mobile Power Source for Smart Phones and Digital Devices 8400mAh Portable Battery Charger. Dual USB 3.1 Amp max Output for Rapid Charging 3.1 amp Max Output allows you to charge 2 devices at the same time. iPhone / iPad Intelligent LED status bar indicates the current battery status Samsung Grade A cells high quality Lithium-ion battery ensures reliability Compatible with all mobile phones charged by USB port. Includes a Micro USB cable