8 in1 Throttle Range Calibration Hub For RC Multirotor ESC Speed Controller 8 in 1 Throttle Calibration Hub for RC Quattro Multirotor ESC Speed Controller 8 in1 Throttle Range Calibration Hub for RC Multirotor ESC Speed 8 in 1 Throttle Range Calibration Hub for MultiRotor ESC Features: 100% Brand new and high quality! Multi-rotor players necessary. Can calibration servel ESC throttle by once,It's convenient 8 group of pins,Up to 8 groups at one time calibration ESCs. Specifications: Size: 31mm x 12mm x 15mm Cable Length: approx. 10cm Net Weight: 6g How To Use 1.To throttle singal wires of ESC1-ESC8 2.To throttle channel of receiver 3.After been connected,power on all ESC,you can calibrate the throttle travel Package includes: 1*8 in 1 ESC throttle