Not sure where the paryt element comes from but seems a good price as the blue one is £14.70 and grey £26.71. reviews mention prices from £8.99 to £19.99.

Gear4's ShowerParty Speaker

Enter the ShowerParty: a nifty portable speaker especially conceived to make all of your showerhead-turn-to-mic dreams come true. But how you ask? This marvelous waterproof sound box is also Bluetooth -enabled, keeping your smartphone, tablet or sound player safe and sound, yet allowing you to listen to all of your favourite tunes with a simple click.
Removable Wall Sucker
The ShowerParty definitely lives up to its name. Apart from being IPX4 certified, making it entirely showerproof, it also features a removable wall sucker so that you can effortlessly stick it onto any flat surface and remove it with just as much ease.
Integrated Speakerphone
The ShowerParty is also equipped with a handy speakerphone. Now you can take all of your important and not-so-important calls while "under the shower". That's right, that excuse just went out the window.
Clear, Rich Immersive Sound
Let's not forget sound quality. The ShowerParty's speaker certainly punches above its weight, delivering a clear, rich and immersive sound.
Hours of Playtime
The ShowerParty also boasts a rechargeable battery with a playtime of up to 4 hours - definitely more than your average shower session. And if it starts to run low on juice, you can simply charge it via USB in no time.
The Perfect Shower Accessory
Skipping tracks, lowering or raising the volume (for those emotionally laden crescendos), taking calls, this portable Bluetooth wonder is the whole package. Now you can rejoice in your hygiene rituals just the way you've always wanted. Cable-free and carefree.