The burglar alarm technician is on the ground. The current system is not 5G capable, so a whole new control panel and set of perimeter contacts must be installed. At least the batteries will be fresh, so I'll be long gone by the time they need replacing. Putting a new coin battery in an awkwardly placed contact is one of the most irritating household maintenance jobs I have -- up on a ladder, neck cricked, struggling to pry the cover off a tiny electronic doohickey while the control panel nags persistently.