OneLink Wireless Alarms provide a cost effective solution when it comes to renovation and retrofit projects where interconnect ability is a requirement. Easily interconnect between floors and new to existing construction wirelessly. OneLink enabled alarm ; Wireless battery Combination Photoelectric Smoke & CO Alarm ; Exclusive! Voice alarm with programmable location. Programmable with up to eleven locations. ; Single button test/silence ; Two silence features - can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarm ; RF Interconnect: reliable and secure radio frequency communication between alarms. 915 MHz frequency with 65,000 security codes and 3 channel frequency hopping. ; Optipath 360 Technology - patented technology provides 360 degrees of direct access to the smoke sensor. ; Perfect Mount - allows for easy alignment of alarm ; Spread Spectrum Horn Tone - Lower and varying frequency makes it easier for the elderly with normal aged related hearing loss to hear the horn. ; Latching Features: Alarm Latch - remembers which unit initiated an alarm. Low Battery Latch: Visually identifies unit in low battery condition. ; End of Life Signal provides audible notification alarms needs to be replaced ; 5-Years Limited Warranty