Features: CCPM Servo Consistency Master / Servo tester The device also can be used as a signal generator for electric speed controller (ESC), then you can test your motor system without using a transmitter and receiver. 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 such as the neutral mode and so on. Specification: Voltage consumption: DC4.8-6V Size: 46 x 32 x 16mm ( approximately ) Original box: NO Color: Blue Item size: 46*32*16 mm ( approximately ) Net weight: 9g"""""""