- Works with all cell phone bands<br />- Also works on other EM emitting devices such as walkie talkie<br />- To use、 simply stick the self-adhesive shield/patch on the back of the cell phone、<br />preferably a location that's close to the digital antenna<br />                                                                                                                                Dimensions: 0.91 in x 0.79 in x 0.08 in<br />Weight: 0.53 oz