Portable Solar Charger + MP3 Player+ FM Transmitter At a Glance... Solar battery charger for portable electronics Charges any USB powered device Stores power in the internal li-ion battery 1200mAh battery capacity Free 2GB micro SD card included (Supports up to 32GB!) MP3 player function FM Transmitter Manufacturer Specifications FM Transmitter Range: 87.5MHz-1.8.5MHz(5 meters) Battery Type: 3.7V 1200mAh Built-in Li-ion battery DC Output: 5.0V±5% 500mA max Power-consumption: <500uA Music format: mp3, wav, wma Kbps:<320K Solar Panel Specification: 5.5V/85mA 3 Hours sun charging for: over 1 hour phone talking time, 8 hours music playing, 8 hours FM emission, 10 hours standby time Memory: Internal: None External: Micro SD card up to 32GB (free 2GB included) Dimensions: H: 1.8 x L: 12 x W: 8 (cm) Package Contents 4 x phone charging converters（Nokia 6101,Moto V3,Samsung A288,Sony-EricssonK750) 2GB TF card USB charging cable 3.5mm Earphone USB to Micro USB cable User manual- English FAQ - Frequently Asked Questions Is it better to charge this solar battery charger with the USB cable or with solar energy? Charging this battery with the USB cable is faster than charging with sunlight. Charging with sunlight is more convenient when you are outdoors, plus it's free.