A wearable physiological monitoring device includes a strap 1, a clasp 2, sensors 3 (ECG electrodes, movement, temperature etc), a display 5, a loudspeaker 6 and a microphone. The speaker may be used to raise an alarm, to play a pre-recorded voice message (e.g. CPR instructions) or to play music. Wireless communications are provided. The device is worn on the wrist of a baby as a sudden infant death (SIDS) monitor. The device provides means for a carer to be alerted to an infants loss of breathing, and provides audible instructions to deal with this event.
