Wireless phone system with three extensions for a total of four handsets. Chargers for each handset location included. Base set plugs into telephone company's network, remotes work via HF signal with base unit. Base unit has remote locator button. Caller ID is supported; handset units display name and calling number if you have caller ID from your service provider. Voicemail can be accessed via base unit or remote handsets. Redial, mute, speaker, and call block (if you subscribe to that service from your service provider) and volume buttons on handsets. Charging indicator light and 'low battery' is displayed on handsets. No user manual included but should be available online. Price includes shipping to continental U.S.