Aluminium body Color temperature(in Kelvin)available:2700K, 3000K, 3500K, 4200K, 5000K, 6500K Color rendering lndex(Ra)Ra≥80 Working Temperature:-20°C~50°C Energy efficiency Class: A+ 25%, 50%, 100%, dimming switch Li-ion Battery 3.7V 4400mAH (LY5001) Micro-USB charging(Attached USB data line), Battery electric power indicate USB output 5.0V/1.0A