Bluetooth® Desktop Speaker 6 hrs Battery 18W Stereo Built-in mic Linkable with RGB Lights
Inwa Outdoor Bluetooth Speakers, Linkable Wireless Speaker Up to 100 Speakers, IPX5 Waterproof, Beat-Driven Light Show, Seamlessly to Phone, TV Box, Projector, Echo Dot, for Patio, Yard, Pool (2 PACK): Amazon.co.uk: Electronics
How to connect multiple Bluetooth speakers around your home | Currys