The C-Series alarms from Prologic feature six different tones, all of which are adjustable using the six volume and sensitivity levels to fully customise your alarm set up.When the alarm detects a bite, both colour LEDs will light up and then one LED will keep blinking for 20 seconds afterwards. The dedicated night light is activated at the touch of a button to illuminate the water in low light conditions. 3x Blue Alarms1x Main UnitAdjustable volume, tone and sensitivity - 6 levels per settingDetector colour: BlueDetector requires a 9V battery (not included)Main unit requires three 1.5 V AAA batteries (not included)Rechargeable USB Lamp2.5mm connector socket for light accessoriesMain unit emits light, sound and vibration signals (optional)WeatherproofMain unit range: 100m (according to terrain)