Quality Assurance: All items were thoroughly tested and packed before shipping. Brand new and high quality. Perfect for GA40 battery. Tools Provide: Include 1 set of Tools kits as photos show, but you may also need other tools in order to be able to fix the device. High Quality Battery: Professional manufacturers. Many years of production experience. Tested under strict quality control standards with professional machines for 3 times before shipping. Over-Charging, Over-Discharging, Over-Heating and Short-Circuiting Protection. Works as good as your battery. Speed up your phone. Easy To Install: Instruction/Manual NOT included, but there are many installation tutorials videos on YouTube to reference. Easy to replace, with use our provide tools, most people should be able to do it. Replace your old battery perfectly. Good After-sales Service: Please contact us when you have any questions, whether pre-sales or after-sales. WUHAO products have a very good after-sales service, please choose us with confidence.