Advice on which ultrasound device to purchase for my condition?

[rhino1616]

good day, on and off for the past 10 years i have suffered from rotator cuff impingement. ive been to physio and they have helped me many times to rehab shoulder with excercises and ultrasound. Im thinking of of purchasing a personal home unit yet im not sure which frequency unit i should buy. 1, 3 or 5 mhz. if i purchase a 1mhz unit is this to strong of a frequency and will it cause more harm. or should i get a 3 or 5 mhz unit. im looking at something like the unit listed here:

US-1000 1Mhz Portable Home Ultrasound Therapy Machine

the unit says it has 3 settings low med, and high.

Any advice would be appreciated. Thank you

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