... alarm system (smoke detector, fire system ) Wireless interconnectable fire alarm system(smoke detector,wireless alarm system )1. Form by DC Operated Wireless Smoke/heat/Carbon Monoxide/Ionization Alarm ... ( VST-WS588I, VST-WS588IH, VST-WH588I , VST-WC588I, VST-WIS588I, and VST-WIS588IH. )2. Insects Proof3. Test button4. High ... decibels at 3 metersEmission distance>60m Wireless smoke alarm system