Nash Siren R3 Receiver Nash Siren R3 Receiver. When a Siren R3 sounds, take notice like never before. Setting new standards in bite registration, the R3s Intelligent Sensing microchip technology eliminates false indications, giving you the ultimate insight into what is happening in your swim. Centred on the change of speed in line movement, Intelligent Sensing means an end to irritating bleeps from wind, undertow, weed, even variable current in flowing waters.The Siren R3 sounds only to alert you to fish activity in a swim. No longer will bobbin creep disturb you in the early hours when conditions change or weed builds up on the line. No longer will there be any doubt or dismissal over unexplained bleeps. The Siren R3 is a revolution connecting angler and carp like never before possible. Put simply, Intelligent Sensing alerts you on a Need to Know basis. The Best By Test THE SIREN R3 boasts market leading remote performance, vastly exceeding the competition. Whilst we would never encourage people to take advantage of the R3s 400 metre plus extreme range capability, the strength of radio signal becomes critical when your rods are not in a clear line of sight such as in dugout swims or when surrounded by dense foliage. Whatever the nature of a swim, its surroundings or obstacles that block weaker signals the R3 will out perform all others.