The Smoke Alarm Transmitter from Bellman & Symfon is part of the Visit Smart Home System that helps you to keep tabs on your home. The Smoke Alarm Transmitter is to detect heat and smoke at the earliest possible stages. When activated, the Transmitter will produce continuous loud alarms and light up the red and green LEDs, also immediately send out a radio signal to the Visit receivers. You will be alerted with loud sounds, bright flashing lights, or vibrations depending on the receiver you have. The Smoke Alarm Transmitter operates with a 10-year lithium battery. It also provides warning of low battery, fault, and end-of-life. The Smoke Alarm Transmitter is a great alerting device to help people with hearing loss, hard of hearing, and deaf informed to stay safe. This device has been certified to standards UL217 / ULc S531.