3d-vedio-screen-magnifier consist latest technology and great quality. Mobile phone screen can be extended upto 3 times, crystal clear and vivid, dynamic feeling stronger! Appropriate for all kinds of mobile phones and all various occasions -- inhouse, outdoor, hiking, in free time etc. Use HD amplification optical technology,no power-driven, less-cost, energy-saver tool and eco- friendly. Reduce the eyes fatigue when you watch videos on the phone. Folding design, small volume, convenient carrying on business travel..