We have developed a modular personal telemetry device. It allows you to determine a person's physiological data and environmental parameters. The system consists of two modules. One of them is attached to the patient's chest with a special strap. Its design includes built-in electrodes for measuring ECG, skin resistance, and chest expansion. The second module is attached to a belt. It contains: a GPS module for determining location; a radiation and ultraviolet radiation level meter and a hazardous gas concentration sensor. The modules are connected via a Bluetooth LE radio channel. The received and pre-processed data is transmitted via a built-in web server (module 2) over a Wi-Fi interface for remote monitoring and analysis. The information is also stored in a local secure SD card-based storage device. It acts as a personal “black box” in case of emergency loss of radio communication. The received data, together with hazard warnings, is displayed in the firefighter's field of vision through augmented reality glasses.