Detail produk dari Steelie Magnetic Car Holder 360 Degrees Rotating Car Phone Mount GPS Stand (Black) (Intl) This magnet metal piece is fragile, please be careful when using it, don't drop it on the floor. The bottom sticker is 3M foam stickers, when stick it on to your car, press it for about 1 minute. Then wait about 12-24 hours before using it!! Too big or too heavy cellphones are not suggested for this holder. The surface for sticking the holder should be clean, dry and smooth. Don't touch the glue with your finger, when stick it to the surface, press it with pressure to make sure it well contacted to the surface. After it stick to the surface, leave it alone for about 12 hours, that time is needed to fasten the glue.