Horrendous dealings with Tts. Do not order your blue-bots from this site. Be warned they come with a 2-prong not a 3-prong plug and the joke is that they send you the uk plugs to fit yourself rather than apologising for the mistake and sorting it. It was up to me to have to gaff around to sort this and I found Tts showed little understanding of busy school/teaching life and thought this customer service was acceptable. Took over a month to get sorted and several emails, trips to pack up items and phone calls. Certainly put us off using Tts in future.