BRK Interconnect Hardwire Smoke Alarm with Battery Backup Size:120 V lengths & one 3/4-inch x

lengths & one 3/4-inch x 3-ft

6 prong spears

there are mounting holes at the edges of the unit

3-pound fixture has a 48inch chain to extend from high ceilings

Now made with synthetic mesh instead of cotton

BRK Interconnect Hardwire Smoke Alarm with Battery Backup Size:120 V lengths & one 3/4-inch xDirect wire in with 9V battery backup. Hardwired with battery backup for protection during power outages. Perfect mount for easy installation. Mounting bracket keeps the alarm secure over a wide rotation range for ideal alignment. Latching alarm indicator, visually identifies unit that initiated alarm or low battery. Interconnects with most First Alert and BRK hardwired alarms. When one alarm sounds, all compatible alarms sound (up to 12 smoke alarms