Features: 
The Perfect Metal Detector Accessory 
Improves Metal Detection Locating Ability 
Waterproof and Submergible Probe 'Tip' 
Used for Placement in Ground, Dirt, Sand, Water, etc. 
Rotary Control Sensitivity Adjustment 
Built-in Speaker for Audible Sound Alerts 
Vibration + LED Light Detection Alerts 
Battery Operated: Requires (1) 9V Battery, Not Included 
Dimensions (L x W x H): 1.8'' x 1.8'' x 9.6''