The Prologic C-Series Pro 4+1+1 RGYB Bite Alarm Set is a complete bite detection system for carp and specimen anglers, combining four bite alarms, a receiver, and a bivvy light. The alarms offer adjustable volume, tones, and sensitivity so you can tailor them to conditions, and each features a night light for low-light visibility. The receiver signals by light, sound, and optional vibration, with a 100m reach depending on terrain, and the set is weatherproof and CE certified. A 2.5mm socket allows connection to illuminated hangers or swingers for additional indication. - Adjustable volume, tones and sensitivity - Night light - Attractive design - Alarm requires a 9V battery (not included) - Receiver requires three 1.5V AAA batteries (not included) - Bivvy light is USB chargeable - CE certified - 2.5mm socket for illuminated hangers or swingers - Receiver signals by light, sound and vibration (optional) - Weatherproof - 100m reach (depending on terrain)