description of fishing annunciator：
 
　　 1.Press on/off, the right light flickers, after flickering, turn on power supply, press it again, the right light flicker, after flickering, turn off power supply. Only when power supply is turned on, other three key-presses can be adjusted.
　　 2.Sensitivity: after power supply is turned on, sensitivity is at its maximum, press it. After “dudu” two times, sensitivity is at its medium, press it again, “dududud” three times, sensitivity is at its lowest, press again “du” for one time, it turns back to sensitivity at its maximum
　　 3.Volume: high and low of volume can be adjusted, press it , change a kind of volume
　　 4.Tone: change of tone can be adjusted, press it , change tone
　　 5.Battery specification is as follows
The JY-1 use 2 NO. 8,1.5v battery
The Jy-2 use 1 9v battery
The Jy-3 use 3 1.5v button battery
The JY-5 use 2 NO. 8,1.5v battery
The JY-6 use 2 NO. 8,1.5v battery
The JY-7 use 2 NO. 8,1.5v battery
1，2，3，4 items of functions JY-3 do not have