Bluetooth Bundle Solar Powered recharging - With sufficient sunlight, 3 hours of sunlight charging will provide about 30 minutes of talk time Lithium Polymer battery - Fully charged internal battery provides up to 15 hours talk time, OR up to 25 days of standby time. Battery is recharged within 2 hours by the included car charger or USB port SpeakerphoneThe Anycom MILOS-9 Bluetooth Headset is a Bluetooth version 2.0 device that provides 9 hours of talk time. With the Anycom MILOS-9 Bluetooth headset you can operate your Bluetooth enabled cell phone handsfree with a wireless connectivity range of 30 feet. Comfortable - Anycom MILOS-9 is also very comfortable to wear all day long because it weighs only 9 grams. Three soft rubber ear plugs in different sizes allow you to adapt the headset to the shape and size of your ear canal for maximum comfort and best hearing results. After a moment you do not even feel wearing it! Clear audio - With Bluetooth 2.0 technology the Anycom MILOS-9 Bluetooth Headset provides a high degree of voice quality for clear communication.