Humminbird Hb 2124 Chirp RadarHB 2124 CHIRP Radar, solid state radar with Doppler bird mode. Humminbird HB 2124 CHIRP Radar The Humminbird HB 2124 CHIRP Radar is solid state CHIRP radar, no magnetron, no warm up time, lower power consumption. Doppler bird mode helps you find baitfish concentrations (and the gamefish that follow them). Compatible with the full range of Humminbird MFDs as radar display. Key Features CHIRP Solid State Radar Doppler Bird Mode (Track Birds for Fish)