Servo pinout

I just got 2 new micro servos there is three wires yellow, red and black, I am assuming that red is + and black is gnd and yellow is control, but how many volts for + and control???

It is a H5-55 hi tech

Google h5-55 servo

Yes, you should always try to find the specifications "first", and try to decipher them
yourself, then ask if it's not clear. That's really the best way to learn everything.
Servos are easy.