Bought it together with Xiaomi powerbank with the same 10Ah. Not sure why but Xiaomi is 2 times thiner. However the problems started when I started using this device to power up my Oculus Go VR headset. Powerbank discharges fine up to 55% (according to the screen), and then suddenly stop charging devices completely which means it's only provides 5Ah capacity. My suggestion is not waste your money and buy Xiaomi instead as its 2 times smaller, support quick charge and cost only $4 more than this one.