Monitoring voltage ,Dual USB sync fast charge, Piano paint, red LED Show, intelligent current, intelligent inner, strong compatibility. LED digital display: monitoring voltage in time. Dual USB intelligent current output: for 2 mobile equipment charge in the same time, high quality inner, automatic identify current to output. Show the voltage: low voltage for long time, maybe damage the car-battery, so that make it don’t start up and car-light can’t work and so on. Charger long time can’t hot: PC+ABS(V0)level, flame retardant materials, Charger long time can’t hot,Green and safe non-toxic.