PRODUCT DESCRIPTION: Charge Most Mobile Phones For Any Emergency Charge MP3 & MP4 Anywhere Any Time You Want Power Comes From Your Pulling, The Harder You Pull, The More Energy You Create Acting As a Spare Battery For Mobile Phone After Full Charged By AC/DC Adapter Small And Light Weight, Easy To Carry It Along With Perfect For Charging Your Phone/ MP3/MP4 While Hiking, Playing Ball Game, Boating, Or Anywhtere In Need PRODUCT DETAILS: Item No.: DMC-001 Battery: 1pc 3.6V 300mAh Li-ion rechargeable battery Built-in alternator Outpout: 250mAh, 6V AC Material: ABS Unit size: 7.8*4.0*2.5cm Unit Weight: 90g Packing: Gift Box Packing size: 13.7*6.7*5.3cm Packaging: 48pcs/ctn/46*31.5*29cm G.W/N.W: 11.5kg/9.6kg