Prologic C-Series Pro 3+1+1 RGY Bite Alarm Set brings together three alarm heads, a receiver, and a bivvy light in a single protective presentation case. The alarms feature tough, waterproof rubberised housings with a classic roller system and six sensitivity levels. They provide an audible tone difference on a dropback take, along with a red LED for a forward run and a white LED for a dropback, so you can always tell what is happening. Each alarm has a 2.5mm socket to power compatible hangers and indicators, and the receiver has a range of up to 11m from the alarms. The included bivvy light is USB rechargeable, magnetic, and activated with a tap of your hand. Features - Rubberised housing - Drop back differential by sound and light - Adjustable volume, tone, and sensitivity - Night light - Alarms requires a 9V block battery (not included) - Receiver requires three AAA 1.5V 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) - Up to 100m reach (depending on terrain) - Weatherproof