Intelligent Power Bank with OLED Screen to Show Battery Level, Output Current and Voltage

   Established in 2013, Crystal 4 has been focusing on the needs of customers, we provide ideal and solution to our customers, helping their growth.

     Usually, we show our thought of an event and our understanding for an affair or give special meaning of products, helping people to understand it. Understanding you and your needs, it is our job, we work at this and we are good at this, it is good that we can help you easy. 

     We serve our customer with all kinds of business activity, such as promotion, changing people’s life, making people known, At present, we provide mobile phone accessories and gift to meeting customers’ all kinds of needs. 
     We usually have difficulty, it is our job to meet problems and difficulties, then find ways to solve them and conquer them, we did this before and we think we also do this now and we will do it in the future, that is why we are standing here and get good reputed customers, we are happy to work with them. 
     This is ourselves, this is our work team, we are proud that we can a wonderful work like this and get good comments from our customers, we are working at this, we believe we can do better in the future, we hope we have more chance to work with people from all the world.

   Crystal 4, Our Professional, since 2013, Our profession, meet your needs, meet your life.