Is this a trailing edge dimmer switch please, for dimmable LEDs?

The info states: "COMPATIBLE WITH LED ...... LAMPS: Thanks to the intelligent trailing edge dimmers having a lower minimum load than leading edge dimmers." This implies to me that it is a trailing edge dimmer. However, the top left of the same page states that it is a leading edge dimmer, as does the 'specifications' pdf. This also states that the dimmer unit will emit a faint buzz. Clicking on the link to the 'user manual'' pdf takes me to Swordfish Paper Trimmers.

Can you still uses this as a 1 gang 1 way switch for bedroom

I would suggest using a different switch BG NBS12 which is a 1 gang 2 way but you can use it as a 1 gang 1 way switch too.

can you use these switches for 1 way as well as 2 way

I have just wired this four gang two way switch for one way operation, the wiring advice states live to common terminal and switched live to L1 terminal however this causes the lights to come on with the switches in the off position and be off in the on position. A continuity test showed that terminal L2 was acting as L! and L1 was acting as L2, so I used L2 for switched live and all is well in the kitchen! Hope this helps.

What depth back box do I need for this?

It says 35mm on the technical specs.

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⚡ Power up your space with sleek safety and style!

LED POWER INDICATOR - Instant visual confirmation of live power status to avoid guesswork.
EFFORTLESS INSTALLATION - Angled colour-coded captive screw terminals simplify wiring and retrofit compatibility.
MOISTURE PROOF DURABILITY - Integrated plastic gasket protects metal edges without compromising style.
SLEEK BRUSHED STEEL DESIGN - Modern elegance meets professional durability with a slim, softly rounded profile.
DOUBLE POLE SWITCHING SAFETY - Ensures complete power isolation for safer installations and peace of mind.

The BG Electrical Switched Fused Connection Unit combines a robust 13A double pole switch with a stylish brushed steel finish and an LED power indicator. Designed for easy installation with angled captive screw terminals and moisture protection, it offers reliable power isolation for hardwired appliances. Backed by a 25-year warranty, it’s the perfect blend of modern design and professional-grade safety.

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Manufacturer	Nexus (Jiaxing)
Part Number	NBS53-01
Product Dimensions	8.6 x 8.6 x 0.1 cm; 158.76 g
Item model number	NBS53-01
Size	one size
Colour	Brushed Steel
Style	Switched Connection Unit & Cable Outlet (Power Indicator)
Finish	Brushed
Voltage	250 Volts
Wattage	3250 watts
Installation method	Screw-In
Item Package Quantity	1
Switch Type	1-way
Special Features	Fast Charging
Included Components	Cable
Batteries included?	No
Batteries Required?	No
Item Weight	159 g

BG Electrical Switched Fused Connection Unit with Neon Indicator and Cable Outlet

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