Dynam E-Retract Landing Gear ?3.0 90?

E-Retract Landing Gear Ø3.0 90°
1:Robust landing gear strut and mounting bracket
2:integrated electric motor with a micro PCB
3:Built in overcurrent protection
4:for aircraft weight : 1-4.0 kg
speed :1.25 sec  @4.8v ,1.00 sec @ 6.0v,0.8sec @7.4v
weight :39.5g
torque:3.5kg.cm
motor type electric brushed
gear : metal
current draw idle 5mA
current draw stall :200mA
voltage :  4.8v-7.4v
retract degree:  90°
hole diameter of diameter: Ø3.0