Specifications: 1.Material:transparent plastic PC/ABS. 2.Solar panel: 4 v/60 MA 3.Size:18.5*8.0*8.0 cm 4.Build-in battery capacity: 3.6 v/800 mAh 5.Replaceable battery:3*AA (not included in package ). 6.USB output voltage: 3.6 V 7.AC adapter input voltage: 110 v-220 v 8.Charging Time by solar: 8-10 hour 9.Charging Time by AC adapter: 5-6 hour 10.Working time by: build-in battery 3-5 hour 11.Working time by AA battery: 5-12 hour