Can i use this with a lamp that already has an inline dimmer switch? So it can be controlled via the existing switch and the app?

Almost certainly not. It does depend on the type of existing dimmer fitted to the lamp, but if it's electronic, it won't work as you seem to be seeking. The wifi switch will be able to switch the lamp on and off, but the "dimness" will only be controlled by the existing dimmer. There is a very slim chance, if the lamp is very old, that it might have a rheostat instead of an electronic dimmer. If that is the case, it might be possible to set the existing dimmer to max brightness, and then control dimming from the WiFi dimmer, but it's pretty unlikely that your lamp has a rheostat dimmer - I haven't seen one in 50 years.

Does this have power monitoring?

No. It's a voice (Alexa) controlled dimmer switch.

Have double checked everything and this will not connect to wifi any ideas or anything else I can try?

You need to set your router to 2.4ghz

Could I plug a double socket into it and run two sets of festoon lights from it and still be dimmable?

Yes, provided the combined wattage is within the maximum for the unit.

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WiFi Smart Dimmer Plug – Voice & App Control | Compatible with Smart Life, Alexa & Google Assistant | Works Over WiFi, No Hub Required | Use with Existing Dimmable LED & Incandescent Bulbs

Product ID: 333137811

Details

Brand
Candeo
Colour
White
Voltage
230 Volts (AC)
Product dimensions
3.3D x 5.7W x
Material
Plastic

💡0-100% smooth dimming control

📶2.4GHz WiFi direct connection

🗣️Alexa & Google voice compatible

$132.30

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Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💡 Dim Smarter, Live Brighter – Your Lamps, Your Rules!

HUB FREE WI FI MAGIC - Connects straight to your 2.4GHz WiFi—no extra hubs, no clutter, just instant smart control.
COMPACT SAFE UK READY - Slim design fits UK sockets without blocking neighbors, CE & RoHS certified for peace of mind.
VOICE APP COMMAND CENTER - Hands-free Alexa or Google Assistant control plus remote app management for ultimate convenience.
SEAMLESS SMART LIGHTING UPGRADE - Turn any dimmable lamp into a smart ambiance powerhouse without buying new bulbs.
DUAL MODE SETUP FOR EVERY ROUTER - EZ Mode for lightning-fast install or AP Mode for tricky BT WiFi routers—smart home setup made effortless.

The Candeo WiFi Smart Dimmer Plug transforms standard dimmable LED and incandescent lamps into fully controllable smart lights with 0-100% dimming. It connects directly to 2.4GHz WiFi without requiring a hub, supports voice commands via Alexa and Google Assistant, and offers flexible dual pairing modes for easy setup. Its compact UK plug design ensures safe, space-saving installation, making it the perfect upgrade for a modern, energy-efficient smart home.

Specifications

Connector type	UK/European electrical plug
Number of poles	2
No. of wires	3
Plug type	Type G
Specification met	CE, RoHS, UKCA, WEEE
Amperage	0.87 Amps
Manufacturer	Candeo Smart Ltd
Part number	C310
Item Weight	100 g
Item model number	C310
Size	1 Count (Pack of 1)
Style	Wifi dimmer plug
Wattage	200 watts
Light source	Incandescent, LED
Cutting Diameter	56 Millimetres
Switch style	Dimmer Switch, Pushbutton Switch
Special Features	Timer in Smart Life app
Specific uses	Indoor use only; Only for use with dimmable lamps
Included components	Wifi dimmable plug, Instructions
Batteries included?	No
Batteries Required?	No
Item diameter	56 Millimetres

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