NEXTEL I55SR Estimated Talk Time: between 100 and 270 minutes (depending on battery) Estimated Standby Time: between 45 and 125 hours (depending on battery) Weight: 5.35 ounces Direct Connect Talk Time: approx.13 hours Certified to Military Standard 810 C/D/E for mechanical shock and vibration - perfect for use in environments where sturdiness is a requirement. Built-in fraud and cloning protection Voice Activation and Voice Recognition 250-entry consolidated phonebook Digital Voice Recorder Selectable font size, with up to eight lines of text SAR Radio frequency emission rating: 1.35 W/kg