This is 8 in1 Throttle Calibration Hub for RC Multirotor ESC Speed Controller. All multirotor setups involve a speed controller (ESC) calibration to set the throttle range. Calibrating ESCs individually is time-consuming. The throttle hub allows you to simultaneously calibrate the throttle range of all of your ESCs saving a great deal of time. It supports up to 8 ESCs making it ideal for a tricopter/quadcopter/hexacopter/octocopter setup – just plug the 3/4/6/8 ESC wires into the hub and the one wire from the hub to your throttle channel on the receiver. You could also use the hub if you want to control multiple servos with a single channel. Specifications and Features : Distribute throttle signal to up to 8 ESC Calibrate throttle range for up to 8 ESC. Cable Length: 100mm Dimensions: 32 x 16 x 13mm Use this throttle hub to calibrate the throttle range for multirotor ESC Max.calibrate 8 ESC simultaneously Weight: 10 gm. Cable length: 10 cm Package Includes : 1 x 8 in1 Throttle Calibration Hub Category: ESC /Speed Controller