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.

Yca1050 Ceiling Mounted Motion Sensor 85 265v Ac 2000w Ceiling

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Description

🚀 Elevate your space with invisible intelligence—light up only when it matters!

ALL AROUND AWARENESS - 360° horizontal and 160° downward PIR detection covers every angle up to 50 feet.
PLUG PLAY SECURITY - Ideal for closets, garages, and hallways—automate lighting and enhance home safety effortlessly.
EFFORTLESS INSTALLATION - Clear wiring terminals and ceiling mount design make setup a breeze for savvy DIY pros.
ENERGY SMART AUTOMATION - Built-in adjustable photocell ensures lights only activate when truly needed, saving power.
SLEEK DISCREET DESIGN - Ultra-slim 1-inch profile keeps ceilings clean and modern—no bulky eyesores here.

The J.LUMI YCA1050 is a ceiling-mounted PIR motion sensor featuring a sleek 1-inch slim profile and 360° plus 160° detection coverage up to 50 feet. Operating on 85-265V AC with a 2000W max load, it includes an energy-saving photocell sensor to automate lighting only when needed. Designed for indoor use in spaces like closets, garages, and hallways, it offers easy installation with clearly marked wiring terminals and discreet ceiling mounting, blending modern aesthetics with smart home functionality.

Specifications

ASIN	B077Z88M8Y
Antenna Location	Indoor spaces, laundry rooms, hallways, garages, walk-in closets
Battery Description	Alkaline
Best Sellers Rank	#130,476 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #62 in Motion-Activated Wall Switches
Brand	J.LUMI
Color	White
Compatible Devices	Light
Customer Reviews	4.0 out of 5 stars 700 Reviews
Item Dimensions D x W x H	4.5"D x 4.5"W x 1"H
Item Type Name	Motion sensor
Item Weight	3.2 Ounces
Manufacturer	J.LUMI
Maximum Range	50 Feet
Mfr Part Number	YCA1050
Model Number	YCA1050
Mounting Type	Ceiling Mount
Operating Temperature	70 Degrees Fahrenheit
Power Source	Corded Electric
UPC	712396765943
Upper Temperature Rating	71 Degrees Fahrenheit

Reviews

A**G

13.01.2019

B**S

19.04.2020

D**A

3.02.2019

J**.

23.08.2020

J**.

25.01.2020

J**S

2.08.2023

J**F

26.10.2022

G**S

11.01.2024

J**E

28.11.2022

R**N

31.01.2019

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R$254

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Brazil.

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