TG-S798 120vAC/240VAC hardwire smoke alarm with 9v battery backup Photoelectric sensor Interconnectable with up to 12 Firex AC/DC smoke alarms Separate green power LED and red alarm LED Five year limited factory warranty -------------------------------------------------------------------------------- Product Details Product Dimensions: 5.0 x 5.0 x 1.4 inches ; 8.0 ounces Shipping Weight: 8.0 ounces. -------------------------------------------------------------------------------- Product Description Product Description: The TG-S798is a 120vAC/24VAC hardwire smoke alarm with an advanced photoelectric design which provides fast detection of slow, smoldering fires. Designed for use in kitchens and furnace rooms, the Firex 4480 smoke alarm reduces nuisance alarms caused by cooking fumes or high humidity. Interconnectable with up to 18 Firex AC/DC units, 6 of which may be TIGRE911 heat alarms. A green power-on LED confirms constant AC power, and a red LED displays alarm/battery status. The TG-798 smoke alarm complies with UL 217. Five year limited factory warranty.