Limitations too difficult to live with. 1) Had to be fully wound for even 1-2 minutes timimg. 2) The wrong shape and surface to grip in all but big, fully functioning hands. 3) The 'noise' so quiet even young 6-year old ears couldn't hear it unless in a quiet room and standing beside it waiting for its 'bell'
I've used no other such product for 24 years and was devastated when I couldn't replace it. Big five supermarkets previously supplying it had never heard of it! The hunt for the product finally had a result; the internet!