Ia ma the user of this product since 3 years as in starting the product was doing best but later on the battery backup of thus device reduced to extend level
The sound coming out which is not hearable beep sounds is coming nowadays
This zebrobnics us u725 is not goodd as it takee much time to charge and cant handle much load so that I can handle it for my more graphics game without charging it cant work so I have to put my charger continuously in the socket
The thinks are different that but I recommend plz take better
