Cardo Scala-500 Bluetooth Headset Is the only one equipped with WindGuard technology to effectively Block wind impact, even under windy outdoor conditions. Featuring a beautiful, small-sized and lightweight design (16g / .56 oz.), the scala-500 also incorporates state-of-the-art functionality: up to 9 hours talk-time (one week standby), call reject, voice activation, mute, redial, toggling and more.