Abstract: Embodiments of the present disclosure, inter alia, are directed to a one piece continuous glucose monitoring (CGM) device (device or sensor) and a fully disposable, one piece, mounting unit for mounting the CGM device, is provided. The device and the mounting unit, in some embodiments, are pre-assembled in the factory to a one piece, disposable, mounting assembly. The mounting assembly, can be comprised of sealed compartment that includes a portion of the sensor and a non-sealed compartment that includes another portion of the sensor. The mounting assembly can be fully automatic, at a button press the sensor is adhered to the skin, and the sensor probe is inserted into the subcutaneous tissue.