It could be used for multiple ways,like emergency alarm for the elderly,the disable/patients care alert,pregnant women/confinement care alert,wake up alarm,children care alarm and som on. One is all.
Packaged a receiver used 3xAAA batteries(not included),a transmitter used 1xCR2032 bsttery(included), a user manual.
The battery insulation sheet in the transmitter should be removed.