How does the community alarm service work? When someone joins our service our partner, Hertfordshire Independent Living Service (HILS), installs discreet, modern technology which connects into the landline telephone (if there isn’t a landline we can offer an alternative alarm unit). A very lightweight and splash proof pendant button is also supplied which can be worn either around the neck or on a wrist strap like a watch. To raise an alert for help, simply press the button on the pendant and our trained operators will speak via the powerful microphone in the alarm unit to find out what the issue is and will provide the appropriate help. or