. Watertight sound head of 5cm2 with BNR Smaller than 5:1 included . 1 & 3 MHz frequencies. . 0 to 2.5 watts /cm2 in Continous mode . Pulsed and continuous modes (10%, 20%, 50% and 100%). . Variable duty cycle outputs of 16Hz, 48Hz, or 100 Hz.. . 10 user-defined memory positions for user protocols . Head warming feature. . Lightweight. . Designed for tabletop, wall mount or mobile use. . Head warming feature. . Head contact control with visual and auditory feedback. . Main unit warranty 3 years, sound head warranty 1 year. . Battery powered option