How it works

Sensing Bladder with Ultrasound

DFree detects the changes in bladder size and predicts urination timing.
DFree needs to be placed 20m above the pubis to detect the bladder properly.


DFree uses safe and non-invasive ultrasound sensor. Ultrasound technology is also used for prenatal checkups as well as other non-medical devices such as tooth brushes so rest assured that its safe to use.

Connect to
Smart Devices

DFree sends alerts to your phone or tablet when it is time to go to the toilet. Set notification threshold so you have ample time to go.





Main Unit (Transmitter) : 3.27” (W) x 3.15” (D) x 1.30” (H)
Sensor : 2.13” (W) x 1.38” (D) x 0.48” (H)


Main Unit (Transmitter) : 2.56 oz.
Sensor : 0.64 oz.

Power Supply

Lithium-ion rechargeable battery


Approximately 24 hours of use
(Fully charged in 4 hours)

How to attach sensor

Apply gel to the sensor and secure
it to the body using a medical tape

Ultrasound sensor on DFree may not be able to accurately track and collect data from the bladder with certain types of users.  These users may have the following conditions:

  • Excessive fat in the lower abdomen area
  • Loose or flabby skin in the lower abdomen area
  • Scar from previous surgery or injury
  • Problems accumulating urine in the bladder 
  • Prone to rashes from use of medical tape and ultrasound gel
  • Pregnant
  • Underage (6 or younger - bladder may be too small to accurately collect data)

DFree app supports iOS devices (iPhone, iPod, iPad) and Android devices (phones and tablets).  

 DFree app currently supports the following devices:

  • [iPhone] iPhone 5 or later
  • [iPod] iPod Touch 6th Gen or later
  • [iPad] iPad 5, iPad Air, iPad Mini2, iPad Pro or later
  • [Android] phones, tablets

*The DFree app may be downloaded for free from the App Store and Google Play. The app supports iOS devices (iPhone, iPad, iPod) running iOS version 10 or later and Android devices (phones, tablets) running Android 4.4 or later.

DFree is not a medical device and is not intended to be used in the diagnosis, prevention, or treatment of diseases or medical conditions.