There is a way to ease your power struggles‎.‎ The latest universal power bank from Genius‎,‎ ECO‎-u521‎,‎ provides you the single power source you‎'‎ll need‎,‎ without the need to carry or purchase extra spare batteries for all your various devices‎.‎ ECO‎-u521 is compatible with just about every 5V Micro USB device – from most smartphones‎,‎ tablet‎,‎ media players‎,‎ game devices‎,‎ e‎-readers and much more‎.‎ It’s small enough size to fit in your pocket without feeling bulky‎,‎ so it’s easy to take with you when you’re on the go‎,‎ and comes in various color options to fit your look‎.‎ ECO‎-u521 has a one year limited warranty and US$ 10 million worldwide product liability insurance‎.‎Technical specifications ‎:‎ 

• Battery Type‎:‎ Li‎-ion Battery
• Capacity‎:‎ 5200mAh / 19.24Wh
• Output‎:‎ 5V / 2.1A
• LED indicator
• Unit Weight‎(‎g‎)‎‎:‎ 117 ±5% 
• Unit Size‎(‎mm‎)‎‎:‎ 85 x 45 x 21
• Retail Package Size‎(‎mm‎)‎‎:‎ 152 x 95 x 35
• PCS/CTN‎:‎ 20 / 4 KG
• CUFT‎:‎ 0.52 /CTN‎:‎ 373 x 205 x 193mm