Radio bite alarm with separate receiver?

Old news! Here is the Balzer MK-BT app which turns the smartphone into a receiver.

* Up to four Balzer MK-BT beepers can be linked
* With precise display of signal strength (up to 40m)
* Battery level indicator
* Bite or drop bite? A double beep as the fish swims toward the angler clearly indicates the difference.
* The smartphone torch can be activated. It flickers when you bite and lights up for 20 seconds. long after
* Vibration alarm can be used on the smartphone
* Sensitivity pitch and volume on the beeper can of course also be controlled separately and without a smartphone