... -frequency heat, it increase machine life. 3,Saddle adopt the high-strength composite materials ( bulletproof glass materials), tenacity of ... from damaging .4,Main structure, strengthening design, enhanced the pressure. Guarantee the stability.5,Lifting Range: Jack can lift or lower ... at night .9,Manual Hand Crank: use the manual hand crank to lower the car if no power when the car jacked.10,According ...