It can connect 1-3 servos simultaneously and such as 1-3 servos consistency and so on. You can also connect 1-3 ESC to and compare their reaction time respectively. Automatic " wiper" mode: make the servo swing like a wipers in the biggest . There are 3 modes to check servos or ESC: mode: turn the knob with different speed, check the reaction time; Neutral mode: make the servo go back to the neutral ; It can connect 3 servos of the CCPM helicopters and select servos. It can also connect the servo of airplanes install the steering-box and adjust planes by using such as the neutral mode and so on., Weight: 0.01873929227 Pounds, Manufacturer: Wresetly