GT Power Helicopter Servo Test Adjustor with CCPM Tester Remote Control Toys Parts Input voltage: DC4.8-6V . Dimensions: 48 x 42 x 17mm . Weight: 31.5 g . Aluminum alloy, anodized. Designed for testing analog and digital servos, ESC controlled, and it can simultaneously test three servos if they are synchronized (This feature is mainly used in model helicopters CCPM servos) . It has three ways of check servos or ESC: 1. Manual mode: turn the knob to view the servo speed of response. . 2. Neutral mode: Test servo neutral point. . 3. Automatic "wiper" mode: The maximum steering angle of the test and swing back and forth. . It can connect 1-3 servos simultaneously and test them consistency. . It 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. . 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. . Package Includes: 1 x GT Power Helicopter Servos Test Adjustor .