Can be synchronized output control 4 servos and used to compare the performance steering gear control of the steering servo output signal can be accurate to 2us (1 milliseconds = 1000 microseconds), you can test the steering gear is able to respond to subtle changes With PPM signal test function in the display, the input PPM signal changes while the input the PPM signal synchronization output to the servo Energized automatically enter manual mode (Manual) 20us 50H analog servo signal cycle, frequency 50Hz, rotary potentiometers to decrease or increase the width of the output pulse.

Button the Select (Note: the key switch function, circulation patterns)
    1. S-1 manual mode (Manual)
    2. S-2-bit mode (Neutral)
    3. S-3 automatic mode (Automatic)
    Keys pulse width:
    1. 50H analog servo signal cycle 20us frequency 50Hz
    2. 125H digital the steering gear a signal cycle 8us frequency 125Hz
    3. 250H Digital Servo signal cycle 4us frequency 250Hz

    Specifications:
    Brand: HJ
    Material: Plastic
    Color: Blue + black
    Input voltage: DC 5~6V
    Output signal width: 800~2200us
    Package size: 14 * 10 * 3cm / 5.5 * 3.9 * 1.2in
    Package weight: 39g / 1.4oz

Warning:
Digital or analog signal button to select the corresponding servos and then plug in the steering servo, to avoid damage to the steering servo.