The alarm must be easily heard (without being excessive) throughout all rooms; on the ground floor, upstairs, and in the basement if any.
You can order additional remote controls if necessary.
Person living alone - Short range
This model includes a remote for hanging in the bathroom, and another within reach in the bedroom.
For this to work, your partner receives the alarm component (connected to their electrical system), and would give you theirs as well if you were mutual partners.
This model (short-distance, and less expensive) can communicate on the same floor, or a floor above or below, when located in an apartment or condo building, or even to a nearby neighbour (in a private residence).
Person living alone - Long range
In a private residence, this device can communicate in a radius of five (5) streets, and in a large apartment building up to five (5) floors, either above or below your residence.
You can also obtain additional remote controls if necessary, that can be synchronized to your system.