Radio bell IMP-34

I have this ringing bought from another supplier (slightly more expensive) because I needed a battery bell, which can be integrated into an existing application and stood by the other party, that the bell is to connect both wireless and wired (only not that he, the IMP-34 offers). This bell can be connected via a call interface relay wired to a residential phone. It's really loud. However, the batteries were already after three months all. Let's see if it was because that was the beginning of the bell often operated (uploading the tones, test for cultivation). It would not be so great if it stays that way, that you have to replace the batteries every three months.