Fail-Safe 10 W Long Range FM Transmitter - CZH-10A - Adjustable from 0 to 10 Watts Adjust between from 0.1 W to 10 W with touch of button. 99 Steps of Power Output Adjustment Stereo sound, Temperature Protection, Standing Wave Protection Includes top of the line 1/4 Wave Ground Plane Antenna with Twist and Stay Technology N-type base Antenna Port for sturdy, longtime support