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 capacity

🔄360° detection

🔌85-265V AC

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Description

💡 Light Up Your Life with Smart Motion Detection!

ENERGY EFFICIENT - Designed to save energy while providing powerful illumination.
WIDE COVERAGE AREA - 360° occupancy detection ensures no corner is left in the dark.
SLEEK SLIM DESIGN - Fits seamlessly into any ceiling, enhancing aesthetics without bulk.
USER FRIENDLY INSTALLATION - Quick and easy setup means you can enjoy smart lighting in no time.
ILLUMINATE YOUR SPACE EFFORTLESSLY - Experience hands-free lighting with advanced PIR technology.

The J.LUMI YCA1050 PIR Motion Sensor Light Switch is a cutting-edge motion detector device designed for modern living. With a voltage range of 85-265V AC and a powerful 2000W capacity, it features a 360-degree occupancy detection system and a sleek 1-inch slim profile, making it the perfect addition to any ceiling for efficient and stylish lighting solutions.

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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