Welcome to the BlÅ« Revolution! Your CTT BlÅ«Series Receiver provides up to four (4) 2.4GHz radio channels for you to detect BlÅ«Series tags. These include the groundbreaking BlÅ«Morpho tag (weighing as little as 0.06g and totally battery-less!) and the BlÅ«Bat tag, a new battery-based tag weighing as little as 0.16g and able to last 76 days beeping every 5 seconds! There are a few things you should know about your BlÅ«Series Receiver, and weâve compiled them below.