All channels allow fully-independent treatment setups as well as ComboPlus technology offering Ultrasound in combination with Interferential Premodulated Biphasic High Voltage pulsed stimulation and Russian stimulation using any available electrotherapy channel * Three Frequency Ultrasound * Dynatron 25 Series models offer 1 2 and 3 MHz frequencies for the greatest flexibility in depth of treatment * Choose 1 MHz for deep treatments 2 MHz for moderate depth or 3 MHz for superficial depth * Choice of 2 cm 5 cm or 10 cm Soundhead