How it works

Sensing Bladder with Ultrasound

DFree uses ultrasound to monitor how much urine is in your bladder in real time.  Sensor needs to be placed about 0.5" above the pubis bone in order to detect the bladder properly.


DFree uses safe and non-invasive ultrasound technology.  Ultrasound technology is also used for prenatal checkups as well as other non-medical devices such as toothbrushes so rest assured that it's safe to use.

Connect to
Smart Devices

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

How to use DFree

Your bladder will expand as you accumulate urine and contract when you urinate. DFree uses ultrasound to measure the size of your bladder and indicates how full it is on a scale of 1-10.

1.  Place and secure the sensor about 0.5” above the pubis bone using any over-the-counter medical tape or optional D-pad accessory (shown below).

2.   The wearable device syncs with the app on your phone/tablet to send you notifications when your urinary volume reaches a threshold





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 5S 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 11 or later and Android devices (phones, tablets) running Android 4.4 or later.  If you have an older version of OS, please be sure to update to the latest version before using the DFree app.

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