FULLY ALARM: with 1 output Speaker and 2 bright blue LED Indicators on each alarm, audible and light alarm, multi-rod custody and don't miss any opportunity. Work at night perfectly and don't need to stare at the buoy always. MULTI ADJUSTMENT: 3 modes of Sensitivity, 4 modes of Tone and 5 modes of Volume, it is really useful and meet your different fishing requirement. POWER: Powered by 1*9V Battery(Don't Included). Give you the opportunity to choose better battery by yourself. [TIPS: 1. Although 9V battery is a kind of universal battery, but there still may exist different size of those battery; Compatible size: 1.89*1.02*0.67inch/4.8*2.6*1.7cm, please make sure the 9V Battery you want to purchase not larger / smaller too much than this size. 2. Battery would be a bit tight to take out once place in for Anti-Fall design, but a stick tool could help easily. INSTALL: Alarm Dimensions are 95mm*40mm, UK standard M3/8 copper screw, fitted with 2.5mm jacks for illuminated drop off bite indicators. Please notice that it's NORMAL if there is collision sounds in the fishing bite alarm when shaking; Because it is the product function design requirement.. ( Tips: use with Swinger could improve the fishing Bite Alarm's signal sensitivity. ) ECONOMICAL: 3pcs alarms in 1 protective case, easy to use and carry; perfect and value for money. FULLY ALARM: with 1 output Speaker and 2 bright blue LED Indicators on each alarm, audible and light alarm, multi-rod custody and don't miss any opportunity. Work at night perfectly and don't need to stare at the buoy always. MULTI ADJUSTMENT: 3 modes of Sensitivity, 4 modes of Tone and 5 modes of Volume, it is really useful and meet your different fishing requirement. POWER: Powered by 1*9V Battery(Don't Included). Give you the opportunity to choose better battery by yourself. [TIPS: 1. Although 9V battery is a kind of universal battery, but there still may exist different size of those battery; Compatible size: 1.89*1.02*0.67inch/4.8*2.6*1.7cm, please make sure the 9V Battery you want to purchase not larger / smaller too much than this size. 2. Battery would be a bit tight to take out once place in for Anti-Fall design, but a stick tool could help easily. INSTALL: Alarm Dimensions are 95mm*40mm, UK standard M3/8 copper screw, fitted with 2.5mm jacks for illuminated drop off bite indicators. Please notice that it's NORMAL if there is collision sounds in the fishing bite alarm when shaking; Because it is the product function design requirement.. ( Tips: use with Swinger could improve the fishing Bite Alarm's signal sensitivity. ) ECONOMICAL: 3pcs alarms in 1 protective case, easy to use and carry; perfect and value for money.