One Full Charge Provides Up to 8 Hours Continuous Talk Time Unit Stores Up to 1,000 Contacts in Your Cell's Phonebook Voice Announce Language Support in English, French, Spanish, German & Italian Windshield and Visor Mounting Bracket Included Caller Announce for Inbound Calls IOGEAR's GBHFK331 Solar Bluetooth Caller Announce Hands Free Car Kit will let you accept only the calls you need and send unwanted calls straight to your voicemail without callers ever knowing they were screened. This "Call Announce"function is also known as text-to-speech. The unit also features clear vocal feedback that will let you know, "power on", "phone is ready for use","pairing successful" among other informative messages. Inbound calls are clearly announced, your own voice commands outbound calls. All this is accomplished without wires and with just one tap of the large master function button. This allows you to stay focused on the primary task of driving. After the initial AC charge, the kit's integrated solar panel harnesses free solar energy in order to stay powered. A small LED will illustrate when the unit is receiving enough sunlight for charging.