An end user medical device comprising: first and second low power consumption modes; an activation function; an activation button to cause the end user medical device to perform the activation function; a real-time clock, the real-time clock not running when the end user medical device is in the first low power consumption mode; a wireless transceiver for transmitting a synchronization request and for receiving synchronization data; and a battery to power the activation function, wireless transceiver, and real-time clock once running; wherein: the activation function is operative to: put the end user medical device in the advertising mode for requesting synchronization, establish a communications connection with a setup synchronization apparatus, receive synchronization data from the setup synchronization apparatus once a communication connection has been established, synchronize the end user medical device in accordance with received synchronization data including setting the real-time clock to the correct time, and determine and store medical data of a user; wherein in the second lower power consumption mode the real-time clock is running and upon completion of synchronization, the end user medical device is configured to automatically disconnect from the setup synchronization apparatus and turn into the second low power consumption state. first and second low power consumption modes; an activation function; an activation button to cause the end user medical device to perform the activation function; a real-time clock, the real-time clock not running when the end user medical device is in the first low power consumption mode; a wireless transceiver for transmitting a synchronization request and for receiving synchronization data; and a battery to power the activation function, wireless transceiver, and real-time clock once running; wherein: the activation function is operative to: put the end user medical device in the advertising mode for requesting synchronization, establish a communications connection with a setup synchronization apparatus, receive synchronization data from the setup synchronization apparatus once a communication connection has been established, synchronize the end user medical device in accordance with received synchronization data including setting the real-time clock to the correct time, and determine and store medical data of a user; wherein in the second lower power consumption mode the real-time clock is running and upon completion of synchronization, the end user medical device is configured to automatically disconnect from the setup synchronization apparatus and turn into the second low power consumption state. put the end user medical device in the advertising mode for requesting synchronization, establish a communications connection with a setup synchronization apparatus, receive synchronization data from the setup synchronization apparatus once a communication connection has been established, synchronize the end user medical device in accordance with received synchronization data including setting the real-time clock to the correct time, and determine and store medical data of a user; wherein in the second lower power consumption mode the real-time clock is running and upon completion of synchronization, the end user medical device is configured to automatically disconnect from the setup synchronization apparatus and turn into the second low power consumption state.