Mount Holder,Elevin(TM)Cell Phone GPS Car Rearview Mirror Mount Holder Stand Cradle Suitable for: mobile phone / smart phone / PDA / MP3 / MP4 devices which width between 40mm-80mm Extra-firm goose neck absorbs vibration, providing a stable viewing environment. Rearview clamp adjustable thickness: 2.3 - 4.0 cm Easy to install, no tools required