XP Deus X35 28cm./11"/ Round 35 Frequency Waterproof DD Metal Detector Search Coil - Total of 35 frequencies: 5 main frequencies with 7 wide offsets 3.7 to 4.4kHz, 7.1 to 8.4kHz, 10.5 to 12.4kHz, 15.2 to 17.8kHz, 23.5 to 27.7kHz - Selectable frequency offset without loss of performance. - TX power adjustment is available on all frequencies and offsets. Special Low frequency TX Boost feature - Normal or Boost option – The transmitted power has 2 selectable levels when using frequencies 3.7Khz to 4.4kHz. The BOOST mode significantly increases the transmission power of the transmitting coil, allowing greater detection levels if the soil conditions allow.