Firefly Mini Battery: 3.2V 500mAh Lithium Iron Phosphate battery; Protected from over-discharge and over-charge; Rated to 1000 cycles Panel: 800mW polycrystalline solar panel; Tempered glass front and anodized aluminium frame; 3m long cable Lamp: 5 SMD LEDs totalling 0.27W After one day of charging the Firefly Mini provides: 36 lumens for 4.2 hours on high setting; 4 lumens for 50 hours on low setting