FireXNull FXN-S1 is a passive, single-use supplemental fire suppression sticker for compatible enclosed indoor electrical outlet and switch boxes in new construction (new work) and existing installations (old work/retrofit). This pack contains 12 identical stickers, each approximately 0.79 x 0.79 x 0.04 in (20 x 20 x 1 mm). Install one FXN-S1 per compatible gang. Heat at the sticker reaching 248°F ± 9°F (120°C ± 5°C) releases encapsulated FK-5-1-12 locally; no power, wiring or batteries are required for activation. Turn OFF power at the circuit breaker and verify the circuit and equipment are de-energized before opening the box. Install fully flat on an available upper-left or upper-right clean, dry interior surface, clear of wiring and device components. Do not install if the device or cover must be forced into place. Inspect whenever the box is opened for service. Replace after known or suspected activation, damage, removal, loss of adhesion or abnormal condition; otherwise follow the recommended replacement interval of up to five years under specified conditions. FXN-S1 does not prevent or repair electrical faults and does not replace required electrical or fire-safety protection. Fire prevention or suppression is not guaranteed. Follow the full installation guide and separate 1-Year Limited Warranty.