The box and the instructions say "led on/off optional", but don't say how. how do you set the led off but unit on?

HI friend， There is just power button, you can turn on/off the PIR sensor. If any other problem,please feel free to contact us via Amazon message or after-sale email fuers.csc01@outlook.com

Does it work with Blaster AS 859

Hi friend, Generally our company's item works with ours, we are not sure whether it can work with other company's, it may have conflict, we advise to choose to use KERUI brand alarm. Thanks.

Does this work with gsm systems, it is a 433mhz device . as required by gsm ?

Dear friend. The KERUI PIR sensor work with KERUI brand GSM alarm. If any othe rproblem,please feel free to contact us via Amazon message or after-sale email fuers.csc01@outlook.com

How can i pair this unit with a alarm horn that i already have that is your unit and the setting fob .

You can pair as many units as you want. You need to reset and pair all units...old and new.

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🚨 Stay one step ahead—wireless security that moves with you!

ENHANCED SIGNAL RANGE - Built-in root antenna boosts signal strength for reliable home-wide coverage.
EFFORTLESS INSTALLATION - Completely wireless design powered by 9V batteries—no messy cables or professional setup required.
INSTANT INTRUDER ALERTS - Triggers and sends alarm signals immediately upon detecting motion within range.
SMART SECURITY ECOSYSTEM - Designed exclusively to work with KERUI alarm systems, creating a synchronized defense network.
SEAMLESS WIRELESS INTEGRATION - 433MHz frequency ensures stable, interference-free connection with your KERUI alarm system.

The KERUI433MHz Home Wireless PIR Infrared Motion Sensor Detector offers a cutting-edge, battery-powered wireless solution for home security. Operating at 433MHz frequency with a built-in root antenna, it reliably detects motion and instantly sends alarm signals to your KERUI control center. Designed for easy wall mounting and seamless integration, this sensor enhances your home alarm system with hassle-free installation and robust coverage.

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Manufacturer	KERUI
Part number	0302433KR-P815
Item Weight	109 g
Package Dimensions	13.59 x 6.6 x 4.8 cm; 109 g
Batteries	3 9V batteries required.
Item model number	KERUI 433
Color	white
Power source type	Battery Powered
Item Package Quantity	1
Plug Profile	Wall Mount
Batteries Included?	No
Batteries Required?	Yes
tech_spec_battery_description_toys	Alkaline

KERUI433MHz Home Wireless PIR Infrared Motion Sensor Detector for Alarm System

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