Synchrosonic Ultrasnd & Hi&lo Volt Stim Galv. Parallel Bars So all you have to Style:Pair (Left & Right) So all you have to do is let it dry and replace the battery * Pump Is An 8 Liter per minute Pump In An Easy to use Design Unit * Provides ultrasound dual channel high volt pulsed DC stimulation and low volt galvanic * Used for iontophoresis * Up to 20 watts of variable or non interrupted ultrasound * High Voltage features reciprocal and ramped surge modes with adjustable surge duration (1 160pps) * Balance Control Feature * Lo Volt Galvanic has constant currentoutput variable surge and continuous mode and reverse polarity * Up to four electrodes *