Why wouldn't this work on an outswinging door?

If it is placed in the interior, you will be able to open the door and go out. If it is placed on the outside of the house, people would be locked inside as it could only be opened from the outside. If you are putting this on a shed or a cupboard, for example, then locking it from the outside would be fine.

Can this be used on double entry doors?

It is designed for a single door installation and is not advised for your use. The base plate have longer screws that could be too long for the inactive door it is mounted to.

Will this latch affect pre-installed alarm sensors? We wouldn’t want the alarm to accidentally be triggered by it!

The alarm system sensor is usually installed at the top of a door that is ~6’6” and the latch can be installed beloe the 5’ mark to allow unhindered visibility. That leaves more than 18” of clearance to ensure that the sensor is not affected. If I’m not mistaken, the sensor on the jam senses a magnet on the door. If steel affected these sensors then they could never be installed on steel doors. This latch has no magnetic components, so the likelihood of interference is abysmally low.

ASIN	B071XJYNBD
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#55,798 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #126 in Door Latches & Bolts
Brand	Defender Security
Color	Brass
Customer Reviews	4.6 4.6 out of 5 stars (3,276)
Date First Available	June 16, 2017
Finish	brass finish
Finish Type	brass finish
Global Trade Identification Number	00049793113153
Included Components	door guard, fasteners
Item Package Quantity	1
Item Weight	9 ounces
Item dimensions L x W x H	4.21 x 1.25 x 2.49 inches
Item model number	U 11315
Lock Type	Deadbolt
Manufacturer	Prime-Line
Material	Brass, Zinc
Model Name	U 11315
Mounting Type	Door Mount
Number of Pieces	1
Part Number	U 11315
Product Dimensions	4.21 x 1.25 x 2.49 inches
Recommended Uses For Product	Home Security, Securing Entry Doors
Shape	Semicircular
Size	1 Pack
Special Feature	Thumb Turn Security Lock, Emergency Access Tool Required
Special Features	Thumb Turn Security Lock, Emergency Access Tool Required
Style	Door Guard
UPC	049793113153

Defender Security U 11315 Swing Bar Door Guard With High Security Auxiliary Lock, Brass Finish, 1-Pack, single pack

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