A system for estimation of pulse transmission time and blood pressure is provided. At least one capacitive sensor is included for providing a first signal that is indicative of at least part of an electrocardiographic waveform of the user. A radio frequency transmitter is included to output a radio frequency wave into a body of the user. A radio frequency receiver is included to receive at least part of the radio frequency wave reflected from an artery within the body of the user. A second signal is output that is indicative of an arrival of a pulse wave at a location within the artery. A processing unit is arranged to determine a pulse transit time based on the first signal and the second signal.
