Features:1. Made of high quality aluminum alloy with anodization which is durable, safe and realiable.2. With 3 modes to test the servo or electronic speed controller, including manual mode: turn the knob to view the servo response speed, neutral mode: making the servo go back to the neutral point, and automatic "wiper" mode: making the servo swing like window wipers in the biggest angle.3. Can conncet 1-3 servos simultaneously to test the synchronism and consistency of the 1-3 servos. 4. Can also connect 1-3 ESC to test and compare their reaction time respectively.5. Can connect 3 servos of the CCPM helicopters to adjust the helicopters and select servos by the neutral position and synchronization functions.6. Can also connect the servo of airplanes, and install the steering-box and adjust rc planes by using the neutral mode. 7. To test analog and digital servos and control the ESC.8. Testing three servos simultaneously whether they are synchronized or not that this function is mainly for CCPM mode.Specification:Type: Servo TesterInput Voltage: DC 4.8-6VSize: 48 x 42 x 17mm or 1.89 x 1.65 x 0.67inchWeight: 44gPackage Includes:1 x Servo Tester