The Carp Zoom Satellite 301 Bite Alarm Set is a set of 3 bite alarms and 1 receiver supplied in a sturdy case. In optimum conditions, the receiver has been successfully tested to reach 200 metres. The alarms each have a different coloured LED light to help you get your bearings at night when you’re on a run. A removable set of snag ears is also included on each detector, so you can take on any situation with this complete set. Each detector has a mini-jack output to power your lighted indicators. All settings for each alarm are made using the controls on the alarms or on the receiver. There are options for volume, tone and sensitivity. Batteries are not included in this set, each alarm requires a 9v battery and the receiver takes 3×1.5v AAA batteries. All in all a very nice and complete set at a very competitive price!