Features: Fully aluminum alloy enclosure, anodized, can test analog and digital servos, can control ESC (motor stepless speed regulation test) It can simultaneously test whether 3 servos are synchronized (this function is mainly applicable to helicopter steering gear in CCPM mode) There are 3 modes to check servos or ESC: Manual mode: turn the knob with different speed, check the reaction time; Neutral mode: make the servo go back to the neutral point; Automatic "window wiper" mode: make the servo swing like a window wipers in the biggest angle. It can connect 1-3 servos simultaneously and test such as 1-3 servos consistency and so on. You can also connect 1-3 ESC to test and compare their reaction time respectively. It can connect 3 servos of the CCPM helicopters, and select servos by neutral and synchronous functions 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. Specification: Material: aluminum alloy Input voltage: DC4.8-6v Channel: 3CH Weight: Approx.28g/1oz Package list: 1 x 3CH ESC Servo Tester