For sale: Honeywell Gent S4-711-V Dual Optical/Heat Fire Alarm Sensor Voice Sounder Device was fitted but it was the incorrect model and removed after a couple of weeks. You get: 1x S4-711-V See other sensors, I can do a bulk deal. Note: this sounder has the newer enhanced quality voice messages (shorter female evac message). At point of sale, I’m happy to flash the sounder to the older quality speech messages. Full proof of operation and serial numbers recorded, so no returns accepted. Any questions, please ask!