Different model sent which failed after 2weeks. Unit protected by fuse which is very loose in holder and causes intermittent loss of power to programmer. Contacted manufacturer to highlight problem - no response. I am considering returning the unit to Amazon and getting a full refund. Until this fuse holder is redesigned, the unit is not fit for purpose.
This is by far the best book that I have found that allows me to identify the dragonflies and damselflies that I have photographed. The illustrations are superb and the text makes the differences, however small, between the species abundantly clear. There should be no mistakes using this book as a definitive reference source.