BESTTEN 4 Pack Door Knob with Lock and Key, Keyed Different Entry Door Knob, for Entrance and Front Door, Matte Black More Prepared Test-Hush Button uses electrochemical sensor

Test-Hush Button uses electrochemical sensor technology to detect poisonous CO gas in your home and alert you by sounding an 85-decibel alarm

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turn on the 'ON' switch at the bottom to enable mode switching via the top switch

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BESTTEN 4 Pack Door Knob with Lock and Key, Keyed Different Entry Door Knob, for Entrance and Front Door, Matte Black More Prepared Test-Hush Button uses electrochemical sensorBrand: BESTTEN Color: Matte Black Features: Reminder: The machine screws come preinstalled in the handle. Please remove them before installation Locks purchased separately will be keyed different. Includes 3 keys per set, KW1 keyway, Not Rekeyable Lock body outside diameter, 2. 54"(64. 6mm) Adjustable latch 2 3 8 2 3 4 (60 70mm) backset. Door thickness from 1 3 8 to 1 3 4 (35 45mm) model number: DK1 ET BK 4PK Part Number: DK1 ET BK 4PK Package