Features: Controller ER-150 V-1B 2S powered storage system seamlessly integrates with the simple door closing system.High accuracy of the system, easy to operate.After connecting three sets of retractions on the controller, the system will automatically start the door system.The system will not be able to start the gate system if one of the three fallbacks on the controller is not connected.The system automatically recognizes situations where interface modes are abandoned, but other retractions do not work.Specifications: Condition: 100% Brand NewOptional Type: Retractable System Controller, Retractable Landing Gear + ControllerController:Working voltage: 5V - 6VController size: 53 x 32 x 10mm / 2.1 x 1.3 x 0.4inController version: v-1b (2S power supply)Suitable for 120mm-150mm EDF jet or other plane up to 12-15kgsRetractable Landing Gear: Working voltage: 7.4 v-8.4 V (2S li-po)Angle: 90 Speed: 5.2 seconds (5v) - 4.3 seconds (6v)Strut hole diameter: 12mm / 0.5inTorque: 15kg cmRetracted size: 27 x 80 x 22mm / 1.1 x 3.1 x 0.9inRetractable mounting plate size: 36 x 48mm / 1.4 x 1.9inPackage List:1 x ER150 Controller 1 x Plug CableOr3 x ER150 Retractable Landing Gear1 x ER150 Controller1 x Plug Cable1 x Wrench1 x Connection Rod5 x Screw1 x Nut(Based on your choice)