Good idea, but not useful for fishing from the shore

Very fast delivery, nicely packaged.
The first test I've tried after proper charging time in my fish pond (80m2) and it kept its promise. The depth or the fish could be read easily (Ipad2 or iPhone 4s)
The test lasted about half an hour. Full euphoria we went the next day to the Danube. This test I had to quit after a short time because the battery had discharged since the previous day. (The contact I naturally dried after use)
Gera recharged and back to the water ..... at very short distances as everything worked on own small pond, but from approximately 4m distance to the terminal of the Fishfinder lost the Bluetooth connection. (Again getestset with my two terminals)
Last chance a week later, however, with the same result.

Conclusion: to make use of the shore at normal fish from the shore, in my opinion nich, but I can imagine use when trolling. Since I only fish from the shore, I sent you the goods back again.

As I have read in the various forums of a faulty batch or production month, I find it strange though that this will still be shipped, but my unit was not produced in this period.