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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BG Electrical Double Wall Light Switch, 2 Way, Raised and Slim Profile, Round Edges, Nexus Metal, Brushed Steel, 20A, 16AX, NBS42

Product ID: 49020447

Details

Brand
British
Connector type
Screw
Contact type
Normally Open
Current rating
20 Amps
Item dimensions L x W x H
8.6 x 3 x 8.6
Material
Alloy Steel

⚡20A high current rating

🔄2-way switching versatility

🛠️Easy installation with screws

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Description

⚡ Switch to sleek power and control—because your space deserves the best!

SLIM RAISED PROFILE - Minimalist design with softly rounded edges that blends seamlessly into any décor.
POWERFUL 20 AMP RATING - Handles high loads effortlessly—perfect for modern LED and heavy-duty lighting.
QUICK HASSLE FREE SETUP - Color-coded terminals and included screws make installation a breeze—no electrician needed.
SLEEK BRUSHED STEEL FINISH - Elevate your space with fingerprint-resistant, professional-grade metal design.
2 WAY SWITCHING FLEXIBILITY - Control your lighting from two locations for ultimate convenience and style.

The BG Electrical Double Wall Light Switch (NBS42) combines a robust 20A, 16AX rating with a stylish brushed steel finish and 2-way switching capability. Designed for easy installation with included hardware, its slim, raised profile and rounded edges offer a modern upgrade to any room. Trusted by thousands with a 4.7-star rating, this switch delivers professional quality and lasting durability for contemporary homes.

Specifications

ASIN	B007CXBGE2
Actuator Type	Rocker
Brand	British General
Circuit Type	2-way
Colour	Brushed Steel
Compatible Devices	Light bulbs, lamps
Connectivity Protocol	Wi-Fi
Connector Type	Screw
Contact Material	Metal
Contact Type	Normally Open
Control Method	Touch
Control Type	2-way touch
Controller Type	Push Button
Country Of Origin	China
Current Rating	20 Amps
Customer Reviews	4.7 4.7 out of 5 stars (2,787)
EU Spare Part Availability Duration	25 Years
Included Components	switch
International Protection Rating	IP00
Item Dimensions	8.6 x 3 x 8.6 centimetres
Item Type Name	10AX Double 2-Way Metal Brushed Steel Light Switch
Lower Temperature Rating	10 Degrees Celsius
Manufacturer	Nexus (Jiaxing)
Manufacturer Part Number	NBS42-01
Material	Alloy Steel
Model Number	NBS42-01
Mounting Type	Wall Mount
Number of Items	1
Number of Positions	1
Operating Voltage	220 Volts
Operation Mode	ON-OFF-ON
Product Warranty	1 year
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	CE
Switch Type	Rocker
Terminal	Screw
Unit Count	12.0 gram
Upper Temperature Rating	40 Degrees Celsius
Wattage	4400 watts

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