(as of Jun 19,2022 08:02:04 UTC – Details)
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Fine tuned the range of ultrasonic frequencies
Three function modes, green, blue and red, green and blue is inaudible, red is audible
It can cover an area of 80 to 120 square meters
Put one in one room as ultrasonic wave can not penetrate through walls and solid objects
Working with low frequency ultrasonic wave