Whites TreasurePRO Metal Detector 10" Waterproof Coil with Treasure Headphones and White's Backpack This bundle includes a pair or Dual Volume Treasure Headphones and a White's Black Backpack Adjustable Length: 46" &gt; 51" All Metal Audio: VCO Audio Output: Speaker & 1/4" Headphone Batteries: 2 - "AA" Battery Life: 20 Disc Audio: Threshold Optional Coils: Coinmaster Family Standard Coil: 10" Number of Presets: 6 Frequency: 7.8 kHz Size: 10" Configuration: Double D