... time:2 to 7 days Solar powered handsfree car kit bluetooth cellphone MP3 Functions:Solar-Powered.Answer ... or sticked onto anywhere you like in your car, such as the sun-visor and windshield.Super ... built-in 600mA rechargeable Li-Ion battery.With a car charger.Extremely long standby time (9 days).High ... quality.Modern and decent design.A perfect kit for your car, truck, RV, mini van, etc. ...