Valentine's Rose Bath

We did have three of these lights but many years ago one of them went duff (RAF slang for broken!).
I can't remember when I bought them for Marlane but it was in our previous house and we've been in this one for 26 years. It was one of those surprise presents that are pretty stupid, until you use them! 
They have a battery, of course, although I did suggest to Marlane that I wire them up to the mains and she can test it when she has her next bath. I think she saw through my wicked plan MMMWWWAAAAAAHAHAHAHA
They change colour too, red, purple, green, blue, yellow, white, quite effective with lots of bubbles in the bath.