Tone Discrimination.Number of Tones: 3Levels of Adjustable Discrimination: 6.Discrimination by Categories.Single Notch Selectable by Category.Adjustable Sensitivity.Battery Life Indicator.Intuitive Menu System.Numerical Depth Readout.1/8" and 1/4" Headphone Jacks.Rubber-Button Control Interface.1 Search Mode: Discrimination Mode.All Metals Motion Mode (2nd Derivative).Transmit Frequency: 7.8 kHz.Preset Ground Balance.Concentric 8" Open-Face Coil System.Locking Ring Coil Connector.Power Supply: 9V Alkaline Battery.