US-1000 vs US-2000 Power Specifications

Ok, so awhile back there was some discussion about safety regarding using the US-1000 / US-2000 devices for transcranial treatment on twitter / X. I think this may have arisen due to lack of accurate data on the power levels of these devices listed specs. I ordered my US-1000 from Tenspros. When I look at their listings, there is possibly some inaccurate power specs for the US-1000 IMO. I would like to get some feedback / clarification on this if possible.

US-1000 Specs from tenspros:

Product Specifications:

Power Source: AC Adapter - 100-240 Volts AC Input (DC 15V)
Frequency: 1.0 MHz ± 10%
ERA Treatment Area: 6.16 cm² ± 20%
Temporal Maximum Power: 4W ± 20%
Output Mode: Pulse
Output Intensity: 1.6W/cm² (Low), 2.6W/cm² (Medium), 4.6W/cm² (High)
Duty Cycle: 8% (Low), 14% (Medium), 29% (High)
Pulse Width:Low: 8% 0.5mS ± 10%Medium: 14% 1mS ± 10%High: 29% 2mS ± 10%
Repetition Rate: 150Hz ± 10%
Working Time: 30 Minutes
Material of Applicator: Aluminum
Beam Type: Collimated

US-2000 Specs from tenspros:

Product Specifications:

Ultrasound Modulation/Acoustic Frequency: 1.0 MHz ±10%
Temporal Maximum Output Power: 6.4W ± 20% (Modulation duty cycle at 100%)
Output Power:(L) 0.32W ± 20%(M) 3.20W ± 20%(H) 6.40W ± 20%
Pulse Repetition Rate: 100Hz ± 10%
Modulation Duty Cycle (Duty Factor): (L) 5%, (M) 50%, (H) 100%
Effective Radiating Area (ERA): 4.0 cm² ± 20%
Beam Non-uniformity Ratio (BNR): 5.0 max
Max. Effective Intensity: 1.6 W/cm² ± 20% (Modulation duty cycle at 100%)
Effective Intensity:(L) 0.08 W/cm² ± 20%(M) 0.80 W/cm² ± 20%(H) 1.60 W/cm² ± 20%
Treatment Time: 5, 10, or 15 minutes
Preheat Time: 3-5 minutes
Wave Form: Pulsed or Continuous
Dimensions: 7.95" L x 1.93" W x 2.76" H (202 x 49 x 70mm)
Weight: 0.43 lbs (193g) (without adapter)
Material of Applicator: Aluminum
Beam Type: Collimated

There seems to be a discrepancy in the Output intensity for the US-1000, whereas the US-2000 listings seem accurate, IMO. The US-1000 peak power output is lower, yet it's low, medium output power is listed as follows:

Output Intensity: 1.6W/cm² (Low), 2.6W/cm² (Medium), 4.6W/cm² (High)

compared to US-2000 output power:

Output Power:(L) 0.32W ± 20%(M) 3.20W ± 20%(H) 6.40W ± 20%

Effective Intensity:(L) 0.08 W/cm² ± 20%(M) 0.80 W/cm² ± 20%(H) 1.60 W/cm² ± 20%

If calculating the output power based upon the peak output power and duty cycle, the low setting of the US-1000 should be similar or below the output power of the US-2000 imo. Could someone please correct me if I am mistaken? I would much appreciate any clarification. My understanding is power output below .7W/cm is around the range that has been used in TUS studies without any safety issues. So, low setting for US-1000 and US-2000 should be fine. Thanks!

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