Here is a smart wearable device that attaches to the body and uses ultrasound technology to monitor your bladder all day long. The data collected is used to predict when you need to go to the bathroom. DFree is made for people dealing with urinary incontinence. It sends notification to your phone or tablet when you need to go to the bathroom.
The device weighs only 2.5 ounces. Its battery lasts for 24 hours under normal usage.