... . It features UL-approved Photoelectric sensing components with precise smoke detection. and long life (18 months) 9V battery operation (9V ... now. smoke alarm, co alarm, gas alarm, heat alarm, water alarm, water leak detector, PW-507S smoke detector, PW-507H heat detector, PW ... , PW-918 carbon monoxide alarm, PW-936 gas leak detector, PW-312 water detector, EN14604 smoke alarm, UL smoke detector, NF ...