Whites Treasuremaster Metal Detector Waterproof Search Coil and Dual Volume Control Headphones EXTRA! Treasure Headphones with DUAL VOLUME CONTROL included in this bundle 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: 9.5" Number of Presets: 5 Frequency: 7.8 kHz Size: 9.5" Configuration: Concentric