An injection device assembly comprising: a device housing having a proximal end and a distal end, the housing defining an interior volume extending along a longitudinal axis between the proximal end and the distal end, and a proximal opening at the proximal end of the housing in communication with the interior volume, the device housing comprising: a user-graspable portion configured to be grasped by a hand of a user, the user-graspable portion extending a first radial distance outward from the longitudinal axis, and an outwardly flared end portion at the proximal end of the housing adjacent to the proximal opening, the outwardly flared end portion extending a second radial distance outward from the longitudinal axis that is greater than the first radial distance; a syringe assembly at least partially disposed within the interior volume, the syringe assembly including (i) a barrel configured to hold a medication, (ii) a piston configured to slide along the longitudinal axis within the barrel, and (iii) an injection needle extending from the barrel; a drive mechanism configured to move the syringe assembly from a storage position to an injection position, and to drive the piston proximally within the barrel so as to dispense the medication from the barrel in a dispensing event; and characterised in that the device assembly comprises one or more main printed circuit boards (PCBs) disposed within the outwardly flared end portion of the device housing, wherein the one or more main PCBs define an opening through which at least a portion of the syringe assembly is configured to pass during the dispensing event, the one or more main PCBs extend a radial distance away from the longitudinal axis that is greater than the first radial distance, and the one or more main PCBs comprise at least one wireless radio frequency antenna and a processing circuit configured to transmit data wirelessly to an external device via the at least one wireless RF antenna. a user-graspable portion configured to be grasped by a hand of a user, the user-graspable portion extending a first radial distance outward from the longitudinal axis, and an outwardly flared end portion at the proximal end of the housing adjacent to the proximal opening, the outwardly flared end portion extending a second radial distance outward from the longitudinal axis that is greater than the first radial distance; a syringe assembly at least partially disposed within the interior volume, the syringe assembly including (i) a barrel configured to hold a medication, (ii) a piston configured to slide along the longitudinal axis within the barrel, and (iii) an injection needle extending from the barrel; a drive mechanism configured to move the syringe assembly from a storage position to an injection position, and to drive the piston proximally within the barrel so as to dispense the medication from the barrel in a dispensing event; and characterised in that the device assembly comprises one or more main printed circuit boards (PCBs) disposed within the outwardly flared end portion of the device housing, wherein the one or more main PCBs define an opening through which at least a portion of the syringe assembly is configured to pass during the dispensing event, the one or more main PCBs extend a radial distance away from the longitudinal axis that is greater than the first radial distance, and the one or more main PCBs comprise at least one wireless radio frequency antenna and a processing circuit configured to transmit data wirelessly to an external device via the at least one wireless RF antenna.