Bite Indicator: Built-in wireless sensor, Sensitivy Control function, High power speaker, On/Off switch, Adjustable volume. Volume can be reduced to "zero", Adjustable pitch, Combination LED light serves as bite interval indicator and operation indicator / 20sec afterglow, Combination LED light in red, blue, green and yellow, depending on the set. Night light can be turned on and off separately, soft touch finish, power out jack, Separate battery compartment, connector for 9V block battery.Receiver: Displays up to 4 bite indicators. On / Off switch. Adjustable volume. High power speaker. Pitch is taken from the bite indicators. Soft touch finish. Distance: 50 - 100 m. Separate battery compartment. Connection for 3xAAA-1.5V batteries. Batteries not included).