4~12X telephoto lens and iPhone case. (with special screw mount used to locate the camera and mobile phone camera). Function: overcome the camera phone can myopia can't far view of the shortcomings and have 12x zoom; Advantages: novel optical path design extreme visual Angle light volume high resolution good color reproduction cell phone image quality has improved significantly. Usage: applicable to watch the game concert traveling animal lovers observe journalists telephoto private detective photographed forensics geological exploration forestry management railway port control the traffic administrative department of the forensics minor evidence for law enforcement and so on. Mini size and lightweight.