This is the RadFlash Personal Dosimeter: a Bluetooth device that measures your radiation exposure and makes the data available on your phone. It has a LCD screen to show readings but also has programmable visual and audible alarms to alert you when radiation exposure in your environment changes.
RadFlash has two alarm thresholds for dose and dose rate. It connects to your smartphone via Bluetooth. It features wireless charging. The Polismart app keeps track of past exposure. It lets you change dose thresholds, enable/disable the alarm, and save dose rate/value based on your GPS location.