This wireless amplifier boosts your cell phone's reception 10X by improving bi-directional signal strength, including voice calls and data streams, resulting in fewer dropped calls and interrupted data downloads, without requiring special programming. The amplifier plugs into your car's cigarette lighter and connects to an external antenna that magnetically attaches to your car's exterior, the amplifier increases the gain up to 50 dB, but requires no physical connection to your cell phone because it relays calls wirelessly, allowing you to continue to use a Bluetooth® headset or speakerphone. The amplifier works with all current cell phone carrier protocols. Plugs into your car's DC power source. Made in the U.S. Amplifier: 5 1/4" L x 4 1/2" W x 1 1/4" H. (1 1/4 lbs.)