The original and some say the best - I-Duck was the first - he is white with a silver beak - you must add him to your collection now!! I-Duck is 9cm high x 11cm long and has a coloured LED and internal battery within a sealed unit and when you put him in the bath he lights up - changing colour as he swims. When you take him out of the water the LED switches off. I-Duck's light should last about 45 hours - how many baths? - work it out yourself!! Sorry but the batteries are not replaceable. Not for children under 12 months. I-Duck comes in his own presentation box - great for gifts.