We noticed that most iPhone users have the habit of using cases. Therefore, we reserved the space between body and phone when designing uDrive Twister. Even the thicken military cases fit. One of the difficulties is that if the space being too big, the J-type structure of Lighting has to extend much longer, which causes the product structure becomes fragile. Thus, through sophisticated calculations and continuous testing, we use reinforced materials and improve mechanical structure to design uDrive Twister.