Product details:

Xi-9-1521 Ice Transducer Ice transducer for use with ICE Helix 5 Chirp GPS G2 or Helix 5 Chirp GPS G2 and the ICE Helix 7 Chirp GPS G2 or Helix 7 Chirp GPS G2. This transducer operates at 130-250 k Hz and covers 15 - 21 degrees on the bottom. Not compatible with non-CHIRP Ice products.