Enjoy the freedom of independent living. No monitoring fees, service charges or contracts ever. Talk directly through the pendant to a 911 emergency operator at the push of a button. Complete coverage in and around your home, up to 600 ft. The world's only 2-way emergency pendant communicator. 24 hour, 7 day a week emergency protector. Pendant can be comfortably worn around the neck, clipped on a belt, or carried in a pocket at all times. No charging necessary. Replaceable alkaline battery (included) lasts 1 year in standby or for up to 30 minutes of talk time. 900 MHz operating frequency. Installs in minutes. No tools required.