made of fire-retardant materials, with battery protective circuit for progressive constant current charge, troubleshooting. ... and overdischarge protection. It is provided with non-corrosive nicad battery, which is convenient for operation and maintenance and safe ... 220V±10%, 50HzEmergency power supply: 3.7V, 600mAh lithium battery,Light source: super high light LEDSwitching time: less than ...