... charger,pls don't more than 4 hours.Otherwise it will extremely easily caused the built-in lithium battery ... don't care the Rechargeable light color,4 hours will filled the electricity. 4.When you connect usb ... can recommend the appropriate type for you, and I will do my utmost to offer you a perfect order ... but after sample place a order ,the sample cost will refund to you !3)OEM Service :OEM service is ...