electric lithium battery folding bike 1, light weught and small size 2,material: magnesium alloy 3,li-battery 36V, 7/8/9/10 ... OLD MEN CAN HOLD IT UP.3, THE BIKE IS MAINLY USE MAGNESIUM ALLOY, ANTI CORROSION, ANTIQUAKE, with tenacity.4,A NEW ... DESIGN AND PERFECT CRAFTWORK, WHICH BROGHT THE BIKE FASHION APPERANCE ...