Hispec Battery Photoelectric Smoke Alarm ** CODE HSA/BP ** The HSA/BP is a photoelectric smoke alarm that warns the occupier of slow smouldering fire. Suitable for use in all domestic dwellings including houses, apartments, mobile homes etc. If you require interconnect-ability between rooms then please enquire out our mains with battery back up range. 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 when less than 30 days to run (Sound & red light indicator) ● Test button verifies battery and alarm operation. ● Sounding a loud alarm signal of exceeding 85 dB in alarm mode at 3 metres. ● Battery Included (9v) ● Dimensions (107 x 35mm) ● 3 Year guarantee.