https://www.hedge-trimmer.net/product/lithium-hedge-trimmers/ The gearbox of this machine is made of aluminum alloy, compared to The gearbox is more resistant to high temperatures and noise, less prone to wear and deformation, and has a better heat dissipation performance, which increases the service life of the machine. The double-blade hedge trimmer is available in two blade sizes, making it more of a professional machine.