Dear bought products look at sales in the product function，good stuff stand the test! We "exclusive of the latest Dbattery enhanced zhaofengyindie"， both in function，appearance and quality will be way ahead， the built-inlithium battery can last 600 Ma shock for about 60 minutes，use a 4 battery can save money， the 4 section Nanfu battery at least 10 yuan， the battery only lasts 30 minutesshaking， dear they calculate than to buy!