Features: 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. It can also connect the servo of airplanes install the steering-box and adjust planes by using With LED indicators. Specifications: Output: 15mA (5.0) Voltage consumption: DC4.8-6V Output signal: 1.5ms ±0.5ms Product size: 44 x 30 x 23mm Product weight: 5g