Huge impact - like having a 4 foot antenna on your cell phone. Improves Reception, Reduce Static in boats, elevators, cars, buildings, tunnels, and mountains. Works on any Analog, Digital, and Tri-band phones. dropped calls. Easy to install, simply peel and stick to the inside of your battery compartment. Name: Mobile phone network signal booster Applicable: Universal Product Type: Sticker Sticker type: Partial decoration Function: enhance mobile phone signal Colour:gold+black Material:metal patch Package Contents: 5 x Cell Phone Signal Sticker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.