An example of FDA approved wireless medical devices is the wireless electrocardiogram. It consists of the ECG monitoring circuit, microcontroller circuit, and an Android mobile phone. The phone has a function that detects if the wearer has fallen down and hasn’t moved for a while, and can call for help. The microcontroller interfaces to Android mobile phone via Bluetooth protocol and the information is relayed to the database server via FTP protocol. Each patients’ monitor, which also communicates with the hospital’s 802.11b network, continuously sends the electrocardiogram data to the network. Meanwhile, the doctor can monitor this data from anywhere in the hospital using his handheld PDA, thereby completing the entire electrocardiogram monitoring process without a single wire.