5dB Antenna for Option Wireless Globesurfer III [Wireless Phone Accessory] Diverts harmful EM radiations into the antenna and away from the user Increases your Option Wireless Globesurfer III performance Can be used in a vehicle, at home, or anywhere else since it's light and portable (weights just 3.1 ounces and measures just 9.6 inches) Up to 5dBi signal gain (4.0 dBi at 800MHz, 4.5dBi at 900MHz, 3.0dBi at 1,700MHz, 4.0dBi at 1,800MHz, 5dBi at 1900MHz, 3.8dBi at 2100MHz, and 3.0dBi at 2,500MHz) Made with top quality craftsmanship and RoHS-compliant components