Sonik Hero X Bivvy LightThis automatic bivvy light adds a whole new level of convenience and offers fantastic value. Use it independently as a traditional bivvy light or set it to activate when an alarm is triggered. A feature so useful; youll wonder how you ever fished without it.Features: Manual on/off mode or automatic illumination mode when alarm triggered Six colour channels (Red, Green, Blue, Yellow, Purple, White) Register up to four alarms per channel Up to 150m range Supplied with magnetic plate or elastic loop bivvy attachment Three brightness levels Silent low battery warning Operates with 3 x AAA batteries (not included).