... start,silent,strong wind,outdoor and indoor use,ultra-low power,save electricity,camping use,PC use,Home use.. ModelQT-U401ASpecifications:4-inch, 1 ... 20"GP:11520 pcs40"GP:24000 pcs40"HQ:27000 pcsUsage:Use USB power cord (supply) to connect PC to start ... , comfortable and practical; ABS material, engaging and environmental protection; Indoor and outdoor design, useful and flexible ; Brushless DC motor, ...