I buy this product 3 years ago and now it is still alive. It is very good as in quality and last long backup in electric cuts for 4-5 hrs, My observation of this product is good, and it also look smart nad cool in design. It is very fast in charging and made of good material. I personally like the mini switch in the back of invtor which helps to convert high level charging to low level that’s mean if you switch onn the switch then it convers and you can use it for you pc backup and also charge your laptop and mobile phones.