Will this allow me to use both monitors at the same time or is it a switch which just lets you switch between screens?

It will allow you to connect and use 2 monitors at the same time

Will this work with sky q? the 3 way splitter i already own connects amazon and my laptop but doesn't work with my sky q.

It will work with any device connected via HDMI as it is simply a connector. However, one thing to bear in mind is that to automatically recognise and change the device it recognised a device that is "active". However, even if on standby it is still considered "active" I hope that helps.

Package Dimensions L x W x H	13 x 9 x 2 centimetres
Package Weight	0.04 Kilograms
Item Weight	54 Grams
Brand	Q4
Colour	Gold
Part number	3.31E+12
Size	1 IN 2 OUT
Guaranteed software updates until	unknown

Bi-Directional 2 Way HDMI Splitter/Switch; 1 IN 2 OUT | 2 IN 1 OUT. Connect 2 Monitors or TV's, or 2 Devices to TV. Dual HDMI Switch, Gold Plated 2-Port HDMI Splitter.

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