3 oz Biofreeze Roll on 10 pack Professional Price lumbar support easy to use twist valve that allows 13C01 easy to use twist valve that allows you to make minute adjustments to the air pressure for a personalized feel Power supply 1 x DC 9 V battery Number of channels 3 semi independent Current amplitude (peak) [High] 14 mA ± 20% [Low] 8 mA ± 20% Output waveform Biphasic rectangular Phase duration 100 μs Frequency 1–500 Hz Safety class according to IEC 60601 1 Internally powered equipment 10 pack Roll on for Professional The roller application allows the Health Care Professional or patient to apply the product without getting product on their hands