Smoke Detector 9v Battery Operated

Stand Alone Smoke Detector 9v Battery OperatedProduct Features:? BSI KITEMARK & CE APPROVAL? Photoelectric sensing technology? Easy installation and maintenance? Battery case at the back of a sensor for easy removal of a battery? Sleek low-profile housing design? Low-battery warning? Test button verifies battery and alarm operation? Sounding a loud alarm signal of exceeding 85 dB in alarm mode