To transform into a private detective, firstly you have to marked all interesting items by gluing a special labels on them. Then just take closer the device and you will hear an appropriate message, eg .: "allspice". When you need to add that spice to the soup - just get the Sherlock closer to the label and press the corresponding button: recorded message will be played. This set includes: 25 self-adhesive labels and 10 reusable keychains - for hanging. They contain RFID tags, so they are identified by using radio waves.