Features: It is made of high quality aluminum alloy, with anodization, which is durable, safe and reliable. It can test analog and digital servos as well as control the ESC. Testing three servos simultaneously whether they are synchronized or not that this function is mainly for CCPM mode. With 3 modes to test the servo or ESC. Manual mode: turn the knob to view the servo response speed. Neutral mode: making the servo go back to the neutral point. Automatic "wiper" mode: making the servo swing at the biggest angle. It can connect 1-3 servos simultaneously to test the synchronism and consistency. Also, it can connect 1-3 ESC to test and compare their reaction time respectively. Can connect 3 servos of the CCPM helicopters to adjust the helicopters and select servos by the neutral position and synchronization functions. Can also connect the servo of airplanes, and you can install the steering-box and adjust rc planes by using the neutral mode. Specification: Material: Metal Color: Shown As Pictures Input Voltage: DC 4.8-6V Size: Approx. 48 * 42 * 17mm / 1.89 * 1.65 * 0.67inch Weight: 28g Type: RC Model Part & Acces Package List: 1 * Servo Tester 1It is made of high quality aluminum alloy, with anodization, which is durable, safe and reliable 2It can test analog and digital servos as well as control the ESC 3Testing three servos simultaneously whether they are synchronized or not that this function is mainly for CCPM mode 4With 3 modes to test the servo or ESC. Manual mode: turn the knob to view the servo response speed. Neutral mode: making the servo go back to the neutral point. Automatic "wiper" mode: making the servo swing at the biggest angle 5It can connect 1-3 servos simultaneously to test the synchronism and consistency