Features:1. Auto power off after 1 minute of inactivity to reduce battery consumption.2. The brake can be adjusted by remote control, which brings more convenience to play.3. Signal lines can be connected to any type of switch, easy to use.4. The tire is made of premium rubber material, which has strong cushioning and high wear resistance.5. It is easy and convenient to install and remove, you can get the perfect combination of look and performance on your model airplane.Specification:Condition: 100% Brand NewMaterial: RubberColor: As Pictures ShownPower Supply: 7.2V-30V battery or use the airplane battery (battery is not included)Input Voltage Range: 2-6SOutput Voltage Range: 6-10VAdjustable Range of Brake: +100% ( -10% - 100%) or -100% ( +10% - +100%)Wheel Diameter: Approx. 65mm/2.6inAxle Bolt Diameter: Approx. 4mm/0.2inWeight: Approx. 225gPackage List:2 * Wheel1 * Connecting Cable1 * PCB Circuit BoardNote:Please allow slight deviation of 1-3mm for manual measurement. Thanks for your understanding.