NESCO NP50000 Close Conduit Nipple 5 in Steel 3 in L Zinc Plated

AC Plug-in operated carbon monoxide alarm. Test/reset button, Tests the unit for proper operation. Resets the carbon monoxide alarm. Tamper resist feature, If activated, unit goes into constant alarm mode if it has been unplugged or has come loose from the outlet. AC Plug-in operated. Easy to install just plug into an AC wall outlet. 9 V battery backup. Provides continuous protection in case of a power failure.