Ray-JrMALL Set 4 PCS Wireless Blue LED Fishing Bite Alarms Receiver Carp Running Black Wireless remote sense bite alarm kit has sound and light alarm while fish bites. It can also send signal to over100 meters away, so you can walk away or have a rest carrying the receiver, not afraid to miss hooked fish. Receiver working power supply: 6F22 9V (built-in) /Alarm working power supply: 6F22 9V (built-in). Three-gear sensitivity/Five-gear tone/Five-gear volume. With 2.38mm hanger indicator jack.