The Honeywell XS100-EN Optical Smoke Alarm has been engineered for reliability and ultimate performance. Complete with a 10 Year lifespan and warranty, a low profile design, tamper proof battery & easy installation they are ideal for any residential property. Offering accurate and rapid detection of fires the XS100-EN using the latest optical sensor technology to ensure reduced false alarms. With an automatic self check feature and dirt compensation Honeywell have designed this alarm with reliability and ease of use in mind. It's brilliant Test with reduced level sound function allows you to complete your weekly tests of the alarm without a full 85 Db alarm going off each time. Optional Wireless Interconnection Using the XW100 Plug in Module any X-Series alarm (including the XS100-EN) can be wireless interconnected to any other X-Series alarm (whether that be Smoke, Heat or Carbon Monoxide) allowing you to create a system (maximum of 32 devices) for your home. A separate wireless module is required for each alarm in the system to interlink. Quantity in Stock : 1000 Pcs