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deployment China f elderly care devices CE certified gas detector elderly care wholesale dementia safety device water leak detector home health care distributor senior-friendly home automation medical equipment wholesaler RoHS compliant sensor interconnected smoke alarm smart home security seniors bulk medical alert system for seniors aging in place supplier shower pull cord alarm home safety for aging parents senior safety export senior safety OEM anti-dry cooking device wh fire detection technology certified fire detector China fire safety manufacturer smart fire platform fire protection solution fire detection case smart municipality fire safety p EN54 smoke test device UKCA marking smoke tester East Asia distributor UL and ETL listed smoke detector test kit HVAC test equipment smoke detector test kit fire alarm test tool detector calibration detector testing equipment safety compliance telescopic test tool stove gas valve shut-off sto simulate smoke test maintenance reminder export 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