RF series smoke, temperature and CO products cascade, test the alarm equipment in the cascade system, and quickly locate the alarm point and mute the alarm equipment when alarming. Ten years of built-in battery, compatible screws, 3M glue fixed. It can be fixed on the wall and can be moved. Left and right big buttons: positioning, testing/mute, corresponding light indication (fire alarm, fault alarm, CO alarm) at a glance. Meet the requirements of CE and RoHS certification.