Description:This high quality small size powerful servo tester works on three different modes :Manual : turn the knob to operate the connected servo.Neutral : automatically centers the servo、 very useful when assembling a new model.Automatic : makes the servo swing back and forth to both ends of the servos max throw. If ?▲mode?÷ button is pressed while powering up the servo tester、 the throws is set to 140% instead of 100%.3 servos or 3 ESC can be connected simultaneously to the device.Package Included:1 x Servo Tester