Can I rekey the key core to a primus locks schlage core?

Experimentally, I found that there seem to be two different types of U-Bolt Pro cylinders, so that the bolt comes with either a Schlage-like keyway or a Kwikset-like keyway (at random). I was personally unable to successfully re-key the Schlage-like keyway to match an OEM Schlage C keyway. A professional locksmith succeeded in re-keying the Kwikset-like keyway to match an OEM Kwikset 980 SmartKey deadbolt (using the Kwikset 980 as the new global key, and discarding the Ultraloq keys). If you contact Ultraloq customer service, they will send you a new cylinder (Schlage-like or Kwikset-like), which you can then bring to a professional locksmith along with your home's existing key. The locksmith's re-key will cost around $25. I recommend that you do not try to re-key yourself, because the Ultraloq cylinders are proprietary and don't match OEM dimensions. Hope this helps.

Can this be used for double doors?

If you have double doors they make a lock that installs on the top corner of one of the doors usually the least used door. It can only be unlocked from inside and pretty much stays locked all the time except when both doors are needed to open. I also use these with roommates on one key locks on my balcony door just to feel safe. They also make a flushmount style that takes little more skill to install. I myself have found double doors can be pushed in if one of the door isn’t locked firmly in place. They aren’t expensive and pretty easy to install hardest part lining up the lock to latch. Hope this helps

can one bridge do multiple locks? like front and back door.

No it can NOT. I bought the UL1 and I bolt pro for the same door. They each need a bridge.

What happens if the batteries go dead? Am I locked out?

You won't be locked out, 1. When the Lock shows the "Low Battery" alarm display, don't worry, you will be able to open your door for 1,000 more times, you will have more than enough time to replace the batteries. 2. This item have a function "Micro-USB For Emergency Power".

Manufacturer	ULTRALOQ
Part Number	U-Bolt Pro
Product Dimensions	7.49 x 7.49 x 3.1 cm; 1.39 kg
Batteries	4 AA batteries required. (included)
Item model number	U-Bolt Pro
Size	Fingerprint + Bluetooth + WiFi Adaptor
Colour	Black, Off-white
Style	Wifi Adaptor+Fingerprint+Bluetooth
Finish	Brushed
Material	Zinc
Pattern	Smart Lock
Shape	Rectangular
Power Source	Battery Powered
Item Package Quantity	1
Number of Pieces	1
Grit Description	Ultra Fine
Special Features	Auto-Lock
Usage	Home / Front Door / Commercial / Residential
Included Components	ULTRALOQ Smart Lock with Fingerprint Scanner and Hidden Key Hole, Wi-Fi Bridge Adaptor, Mounting Hardware, 2 Backup Keys, AA Alkaline Batteries, User Guide
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Battery description	AA
Item Weight	1.39 kg

ULTRALOQ U-Bolt Pro Smart Lock with WiFi Bridge, 7-in-1 Fingerprint Keyless Entry, Backlit Keypad, Auto Unlock, Voice Control via Alexa and Google

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