what its the correct ceiling junction box ? i understand should be round and 4" , or should be another size or not round?

If you are installing new, go with the 4" round ceiling box. If you are working w/ anything else, the holes might still line up and if not, you can get all sorts of adapters hardware at the local home center.

Does this pick up motion on the other side of walls? (e.g. motion not in the room)

This is a PIR (passive infrared) motion sensor, which detects infra-red signal emitted from the object (a person or a pet) to trigger the load. Therefore, the sensor can only detect motions of an infrared source in the same room, but not beyond walls. There are other type of motion sensor that uses Doppler radar signal to detect objects. J.LUMI carries another model of motion sensor, SKU YCA2002, that is a radar enabled motion sensor and can detect objects behind thin door or thin plaster doors. For that model, please search on Amazon using key words "J.LUMI YCA2002".

Are the screw holes set for mounting on a standard 4” hexagon box?

To mount on a standard 4" hexagon box, please purchase one additional mounting accessory. Search on Amazon using terms "J.LUMI YCA1050A". The listing page can be accessed via the following link (please copy and paste into your browser). https://www.amazon.com/dp/B08BYD1HPJ

can you turn off the photocell?

Not completely, but it can be turned down to just a few lux.

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YCA1050 PIR Motion Sensor Light Switch, 85-265V AC 2000W, Ceiling Motion Sensor, 360 Degree Occupancy Detector, 1-inch Slim Profile, White

Product ID: 274804283

Details

Brand
J.LUMI
Colour
White
Item weight
3.2 Ounces
Maximum range
50 Feet
Power source
Battery

⚡2000W high power capacity

📏1-inch ultra-slim profile

🔄360° full coverage detection

AED 115

Duties & taxes included

In stock

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Description

🚨 Elevate your space with invisible power and total control!

SMART HOME READY - Integrates smoothly with burglar alarms and automated lighting systems to elevate your smart space.
DISCREET MODERN DESIGN - Sleek 1-inch slim profile blends invisibly into your ceiling for a clean, professional look.
POWERHOUSE PERFORMANCE - Supports up to 2000W load, perfect for controlling high-power lighting effortlessly.
PLUG PLAY INSTALLATION - Battery-powered and ceiling-mount ready for quick setup without rewiring hassles.
SEAMLESS 360 DETECTION - Catch every movement with full-circle occupancy sensing for ultimate security and automation.

The YCA1050 PIR Motion Sensor Light Switch is a cutting-edge, battery-powered ceiling-mounted device featuring a 360-degree occupancy detector and a slim 1-inch profile. It supports up to 2000W, making it ideal for automated lighting and security systems, delivering seamless motion-activated control with a sleek, modern design.

Specifications

ASIN	B077Z88M8Y
Antenna Location	home security, automated lighting control
Battery Description	Alkaline
Best Sellers Rank	#114,276 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #228 in Motion Detectors
Brand	J.LUMI
Color	White
Compatible Devices	Light
Customer Reviews	4.0 4.0 out of 5 stars (672)
Item Dimensions D x W x H	11.4D x 11.4W x 2.5H centimeters
Item Weight	3.2 Ounces
Manufacturer	Generic
Maximum Range	50 Feet
Mfr Part Number	YCA1050
Model Number	YCA1050
Mounting Type	Ceiling Mount
Power Source	Battery Powered
UPC	712396765943

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