A wireless interconnected carbon monoxide alarm is compatible with other detectors (Smoke alarm, Remote controller, Wifi interconnected smoke alarm)wireless-enabled alarms in your home to create a wireless safety network Up to 20~50 compatible interconnected alarms can communicate with each other and alert you when there is a problem across the house even in a different room or on a different floor. You can choose the Interconnected Carbon monoxide alarm from : 1: 10 Years Battery life or 2 years battery life optional. Sealed in Lithium battery with 10 years battery life is avilable 2: WIth LCD displayer or without LCD displayer 3: With Buzzer alarm or with Human Voice Alarm 4: With Temperature &Humidity detection or without 8dB sound, DC6V lithium battery-powered with 10 years of battery life, One goes all go wireless interconnected co alarms. All of the wireless interconnected carbon monoxide detectors are CE BS EN50291 new standard approved by the TUV laboratory. OEM service Welcomed. Please e-mail us for wholesale factory price.