Fangrui Product Details It Can Easily Detect And Set The Virtual Position, Jitter And Center Position Of The Server It Can Connect Two Sets Of Servos Or Escs; Single-chip Control, Good Stability And High Precision Turn The Knob To Detect The Servo If You Connect An Electronic Speed Regulator (brushless Or Brushless), You Can Get Rid Of The Remote Control Device For Manual Speed Regulation, Which Is Very Practical For Testing The Performance Of The Speed Regulator Or Motor, And You Dont Need To Connect The Remote Control And The Receiver It Is Equivalent To The Function Of A Manual Receiver, Simulating The Transmitters Steering Through The Knob Adjustment Method: Manual Power Supply Input Voltage: 5-24v Application Range: Testing Brushless Motors, Servos Output Signal: 50hz High Level 0.5ms To 2.5ms Colour:as Shown Material:pcb Package Contents: 1 X Steering Gear Esc Tester Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Pict