Securityman 2-in-1 Adjustable Door Knob Alarm Jammer & Sliding Patio Door Security Bar with 120db Loud Alert Siren | Durable & Rugged Iron, Sturdy on Most Floors & Windows (Protects Against Scratches)Category: Door Security BarSecurityMan SECURITYBARA The SecurityMan SECURITYBARA is a heavy duty; dual function security bar made from high grade iron with an ear piercing 120dB siren that will sound off as soon as an intruder attempts to force the door open. The SECURITYBARA is fully adjustable with an angled rubber bottom that assures full contact and strong grip on all types of floors without scratching them. Scare Away Burglars The extremely loud 120db siren will alarm you and your loved ones up to 1000ft away! And with included 9 Volt Battery you won't have to change the battery for up to a year. Two for the Price of One Comes with two sets of easy interchangeable door caps: one for the hinged doors (max length = 43.7") and one for sliding patios doors (max length = 39.25") Heavy Duty and Secure Constructed of high grade iron that can withstand 350lbs of force Adjustable to Fit Different Doors and Sliding Patio Doors Bar can be adjusted between 22.25"-43.7" with 15 adjustable notches *please note: the sliding door caps decrease the maximum length to 39.25" Works on All Types of Floors without Worrying about Scratching Them Tile, Hardwood, Linoleum, Carpet, Stone, Laminate, Ceramic, Vinyl, Cork, etc. Easy to Use Step 1: Push lock pin in to allow rod the freedom to slide Step 2: Twist the rod, Step 3: Slide to desired length and align the notch to the pin to pop up and lock the Securitybar in place.