Pyle Secure Scan Handheld Security Metal Detector Security Scanner Adjustable Sensitivity and Headphone Jack High Sensitivity Even Detects Small Hidden Metal Objects - Easy & Convenient Use, No Adjustments Necessary LED Lights, Vibration and Varying Tone Sound Alerts to the Detection of Metal - High/Low Sensitivity Settings Varying Metal Detection Tones According to Metal Object Size - Detection Sensitivity: 2.5mm Steel Ball 3.55mm Headphone Jack for Detecting in Noisy Environments - 9V Battery Required - Operation Frequency: 22kHz Operation Temp: -20 to 90 degrees F - Perfect for Security, Safety, Indoor/Outdoor Events Size: 16.0'' x 3.3'' x 1.7'' Inch