Specification: Type Laminated solar panels / assemblies Material Monocrystalline silicon Maximum power 7.5 (W) Working current 0-1.5a (A) Working voltage 5 (V) Open circuit voltage 6.5 (V) Short circuit current 1.5 (A) Size 17.5 x 32.5cm Solar cell conversion efficiency 19% Output interface USBApplication Mobile phone, PDA.MP3, MP4, digital camera, . PSP, GPS, bluetooth headset Package included:1x Solar charging board 2x Hang ring