Colour selected by holding down volume button and pressing sensitivity button to change. LED's adjusted by holding down volume button and pressing tone button. D-Tec Sensing System/Roller wheel technology for clear, consistent bite detection. Power out socket 2.5mm - for use with illuminated bite indicators such as the Fox Illuminated Swinger®. Batteries are too low when the LEDs automatically begin to flash red every 2 seconds.Cone speaker for crisp sound. Rubber inlays to protect your rod and hold it in place on savage bites. Takes small N Type/ LR1 batteries. Metal (Alloy) 3/8 BSF thread. For the best bite indication always use in conjunction with a Bobbin, Hanger or Swinger. This item is in the category "Sporting Goods\Fishing\Anglers' Equipment\Bite Alarms".angling" and is located in this country: GB. This item can be shipped to United Kingdom.